Legality of incest in the United States
Updated: 11/6/2025, 1:03:05 AM Wikipedia source
Laws regarding incest in the United States vary widely between jurisdictions regarding both the definition of the offense and penalties for its commission.
Tables
Laws regarding incest in the United States: States : .mw- Federal district : Territories : · Table
Alabama
Alabama
Jurisdiction
Alabama
Prohibited relationships
Either legitimately or illegitimately:
His ancestor or descendant by blood or adoption; or
His brother or sister of the whole or half-blood or by adoption; or
His stepchild or stepparent, while the marriage creating the relationship exists; or
His aunt, uncle, nephew or niece of the whole or half-blood.
Prohibited acts
Marriage, intercourse
Penalties
A Class C felony, punishable by a prison term of "...not more than 10 years or less than 1 year and 1 day..." and a fine of up to $15,000.
Alaska
Alaska
Jurisdiction
Alaska
Prohibited relationships
Either legitimately or illegitimately:
an ancestor or descendant of the whole or half blood; or
a brother or sister of the whole or half blood; or
an uncle, aunt, nephew, or niece by blood.
Prohibited acts
Sexual penetration (being 18 years of age or older)
Penalties
A Class C felony, punishable by a prison term "between 1 to 5 years" and up to a $50,000 fine.
American Samoa
American Samoa
Jurisdiction
American Samoa
Prohibited relationships
A person he knows to be:
his ancestor or descendant by blood or adoption; or
his stepchild or stepparent, while the marriage creating that relationship exists and while the stepchild is 18 years of age or less; or
his brother or sister of the whole or half-blood; or
his uncle, aunt, nephew, or niece of the whole blood.
Prohibited acts
Marriage, sexual intercourse, deviate sexual intercourse
Penalties
A Class D felony, punishable by a prison term "not to exceed 5 years" and up to a $5,000 fine.
Arizona
Arizona
Jurisdiction
Arizona
Prohibited relationships
Persons with degrees of consanguinity which makes marriage incestuous and void. These are:
between parents and children, including grandparents and grandchildren of every degree
between brothers and sisters of the one-half as well as the whole blood, and
between uncles and nieces, aunts and nephews and between first cousins
Exception: first cousins may marry if both are 65 years of age or older, and can prove to a superior court judge in the state that one of the cousins is unable to reproduce.
Prohibited acts
Marriage, intercourse (cited in state law as fornication), or adultery
Penalties
A class 4 felony, with an imprisonment term ranging between 1 and 3 and three-quarter years, depending on the severity.
Arkansas
Arkansas
Jurisdiction
Arkansas
Prohibited relationships
The person committing the act being at least 16 years of age, knowingly, and without regard to legitimacy, including blood relationships:
An ancestor or a descendant;
A stepchild or adopted child;
A brother or sister of the whole or half blood;
An uncle, aunt, nephew, or niece; or
A stepgrandchild or adopted grandchild.
Prohibited acts
Marriage, sexual intercourse, or deviate sexual activity with a prohibited person.
Penalties
A Class C felony punishable by imprisonment from 3 to 10 years for the first offense and a fine of up to $10,000.
California
California
Jurisdiction
California
Prohibited relationships
Being 14 years of age or olderα, persons within degrees of consanguinity which make marriages incestuous and void, without regard to the legitimacy of the relationship. These are:
Parents and children
Ancestors and descendants of every degree
Siblings of the half or whole blood
Uncles or aunts & nieces or nephews
Prohibited acts
Marriage, sexual intercourse (cited in state law as fornication) or adultery
Penalties
"...imprisonment in the state prison" (specific penalty not described by state law)
Registration as a sex offender (for life until January 1, 2021; at least 20 years from date of conviction [if only serving probation] or date of release as of January 1, 2021)
Colorado
Colorado
Jurisdiction
Colorado
Prohibited relationships
Ancestor or descendant, including a natural child, child by adoption, or stepchild, a brother or sister of the whole or half blood, or an uncle, aunt, nephew, or niece of the whole blood ("descendant" includes a child by adoption and a stepchild, but only if the person is not legally married to the child by adoption or the stepchild).
Prohibited acts
Marriage, sexual penetration, sexual intrusion, sexual contact
Penalties
Incest: 2y to 6y and $2,000 (minimum) to $500,000 fine; Aggravated incest: 4y to 12 y and $3,000 (minimum) to $750,000 fine. A conviction for incest or aggravated incest will also result in a sentence of lifetime supervision, which means electronic tagging for life, under the Lifetime Supervision of Sex Offenders Act 1998, which also applies to incest, under Part 10 of Title 18 of the Colorado Revised Statutes.
Connecticut
Connecticut
Jurisdiction
Connecticut
Prohibited relationships
Any person related within degrees specified in 46b-21; No man may marry his mother, grandmother, daughter, granddaughter, sister, aunt, niece, stepmother or stepdaughter, and no woman may marry her father, grandfather, son, grandson, brother, uncle, nephew, stepfather or stepson.
"a person is guilty of sexual assault in the third degree when such person engages in sexual intercourse with another person whom the actor knows to be related to him or her within any of the degrees of kindred specified in the statute that specifies which relatives are prohibited from marrying one another."
Prohibited acts
Marriage; sexual intercourse
Penalties
1y to 5y and $5,000 fine
Delaware
Delaware
Jurisdiction
Delaware
Prohibited relationships
Without regard to legitimacy or adoption, male & his child, parent, brother, sister, grandchild, niece or nephew, father's sister or brother, mother's sister or brother, father's wife, wife's child, child of his wife's son or daughter; female & her parent, child, brother, sister, grandchild, niece or nephew, father's sister or brother, mother's sister or brother, mother's husband, husband's child, child of her husband's son or daughter.
Prohibited acts
Sexual intercourse
Penalties
Up to 1y and $2,300 fine
District of Columbia
District of Columbia
Jurisdiction
District of Columbia
Prohibited relationships
Any person related to another person (not including the 4th degree of consanguinity); marriage void if between man with his grandmother, grandfather's wife, wife's grandmother, father's sister, mother's sister, mother, stepmother, wife's mother, daughter, wife's daughter, son's wife, sister, son's daughter, daughter's daughter, son's son's wife, daughter's son's wife, wife's son's daughter, wife's daughter's daughter, brother's daughter, sister's daughter; between woman with her grandfather, grandmother's husband, husband's grandfather, father's brother, mother's brother, father, stepfather, husband's father, son, husband's son, daughter's husband, brother, son's son, daughter's son, son's daughter's husband, daughter's daughter's husband, husband's son's son, husband's daughter's son, brother's son, sister's son.
Prohibited acts
Marriage, cohabitation, sexual intercourse
Penalties
Up to 12y and $37,500 fine
Florida
Florida
Jurisdiction
Florida
Prohibited relationships
Any person related by lineal consanguinity, or a brother, sister, uncle, aunt, nephew, or niece
Prohibited acts
Marriage, sexual intercourse (defined as the penetration of the female sex organ by the male sex organ, however slight; emission of semen is not required).
Penalties
Up to 5y (up to 15y in some cases) and $5,000 fine
Georgia
Georgia
Jurisdiction
Georgia
Prohibited relationships
Person known to be (by blood or marriage): (1) Father and child or stepchild; (2) Mother and child or stepchild; (3) Brother and sister of the whole blood or of the half blood; (4) Grandparent and grandchild; (5) Aunt and nephew; or (6) Uncle and niece.
Prohibited acts
Sexual intercourse
Penalties
10y to 30y
Hawaii
Hawaii
Jurisdiction
Hawaii
Prohibited relationships
Persons within degrees of consanguinity or affinity within which marriage is prohibited.
Prohibited acts
Sexual penetration
Penalties
Up to 5y
Idaho
Idaho
Jurisdiction
Idaho
Prohibited relationships
Parents and children, ancestors and descendants of every degree, and between brothers and sisters of the half (1/2) as well as the whole blood, and between uncles and nieces, or aunts and nephews, are incestuous, and void from the beginning, whether the relationship is legitimate or illegitimate.
Prohibited acts
Marriage, sexual intercourse, adultery
Penalties
Up to 15y. In the case the victim is under 18 years of age, up to life imprisonment
Illinois
Illinois
Jurisdiction
Illinois
Prohibited relationships
Person related to other person as a (i) Brother or sister, either of the whole blood or the half blood; or (ii) Father or mother, when the child, regardless of legitimacy and regardless of whether the child was of the whole blood or half-blood or was adopted, was 18 years of age or over when the act was committed; or (iii) Stepfather or stepmother, when the stepchild was 18 years of age or over when the act was committed .
Prohibited acts
Sexual penetration
Penalties
2y to 10y and $25,000 fine (more if specified)
Indiana
Indiana
Jurisdiction
Indiana
Prohibited relationships
Person known to be biological parent, child, grandparent, grandchild, sibling, aunt, uncle, niece, or nephew.
Prohibited acts
Sexual intercourse, deviate sexual conduct, marriage (unless valid where entered)
Penalties
1y to 6y (advisory)
Iowa
Iowa
Jurisdiction
Iowa
Prohibited relationships
Legitimately or illegitimately: Person knows to be ancestor, descendant, brother or sister of whole or half blood, aunt, uncle, niece or nephew.
Prohibited acts
Sexual act
Penalties
Up to 5y and $7,500 fine
Guam
Guam
Jurisdiction
Guam
Prohibited relationships
An ancestor or descendant, a brother or sister of the whole or half blood or an uncle, aunt, nephew or niece of the whole blood.
Prohibited acts
Knowing marriage or cohabitation
Penalties
Up to 1y
Kansas
Kansas
Jurisdiction
Kansas
Prohibited relationships
Person known to be biologically related as parent, child, grandparent of any degree, grandchild of any degree, brother, sister, half-brother, half-sister, uncle, aunt, nephew, niece.
Prohibited acts
Marriage, sexual intercourse, sodomy
Penalties
5m-13m (simple), 31m-136m (aggravated) and/or up to $100,000 fine for either simple or aggravated.
Kentucky
Kentucky
Jurisdiction
Kentucky
Prohibited relationships
Known ancestor, descendant, brother, or sister without regard to legitimacy, adoption, whole or half blood, or stepparent and stepchild.
Prohibited acts
Sexual intercourse or deviate sexual intercourse
Penalties
5y to life imprisonment
Louisiana
Louisiana
Jurisdiction
Louisiana
Prohibited relationships
Ascendant or descendant, brother or sister, uncle or niece, aunt or nephew (with knowledge), related by consanguinity either whole or half blood
Prohibited acts
Marriage (unless married legally in another state) or sexual intercourse.
Penalties
5y to 30y
Maine
Maine
Jurisdiction
Maine
Prohibited relationships
Persons known to be within the 2nd degree of consanguinity (woman and her father, grandfather, son, grandson, brother, brother's son, sister's son, father's brother or mother's brother; man and his mother, grandmother, daughter, granddaughter, sister, brother's daughter, sister's daughter, father's sister or mother's sister).
Prohibited acts
Sexual intercourse (any penetration of the female sex organ by the male sex organ)
Penalties
Up to 5y and/or $5000 fine
Maryland
Maryland
Jurisdiction
Maryland
Prohibited relationships
Persons who may not marry, within 3 degrees of lineal consanguinity or 1 degree of collateral consanguinity (an individual's grandparent, parent, child, sibling, grandchild, grandparent's spouse, spouse's grandparent, parent's sibling, stepparent, spouse's parent, spouse's child, child's spouse, grandchild's spouse, spouse's grandchild, or sibling's child).
Prohibited acts
Vaginal intercourse
Penalties
1y to 10y
Massachusetts
Massachusetts
Jurisdiction
Massachusetts
Prohibited relationships
Persons within degrees of consanguinity which make marriages incestuous and void: Marriages between parents and children, ancestors and descendants of every degree, and between brothers and sisters of the half (1/2) as well as the whole blood, and between uncles and nieces, or aunts and nephews, are incestuous, and void from the beginning, whether the relationship is legitimate or illegitimate.
Prohibited acts
Marriage, sexual intercourse, sexual activities (including but not limited to, oral or anal intercourse, fellatio, cunnilingus, or other penetration of a part of a person's body, or insertion of an object into the genital or anal opening of another person's body, or the manual manipulation of the genitalia of another person's body)
Penalties
Up to 20y
Michigan
Michigan
Jurisdiction
Michigan
Prohibited relationships
Criminal sexual conduct in the 4th degree includes when the actors are related "by blood or affinity to the third degree."
Prohibited acts
Sexual contact
Penalties
Up to 2y or a fine of up to $500 or both
Minnesota
Minnesota
Jurisdiction
Minnesota
Prohibited relationships
Person "nearer of kin to the actor than first cousin…whether of the half or the whole blood, with knowledge of the relationship".
Prohibited acts
Sexual intercourse
Penalties
Up to 10y
Mississippi
Mississippi
Jurisdiction
Mississippi
Prohibited relationships
Person within degrees of consanguinity which make marriages incestuous and void due to blood.
Prohibited acts
Marriage or cohabitation, adultery or sexual intercourse
Penalties
Up to 10y or $500 fine
Missouri
Missouri
Jurisdiction
Missouri
Prohibited relationships
Persons known to be ancestor or descendant by blood or adoption; stepchild while the marriage creating the relationship exists; brother or sister of whole or half blood; or uncle, aunt, nephew, or niece of the whole blood.
Prohibited acts
Marriage, cohabitation, sexual intercourse, sexual contact
Penalties
Up to 7y
Montana
Montana
Jurisdiction
Montana
Prohibited relationships
Person known to an ancestor, a descendant, a brother or sister of the whole or half-blood, or a stepson or step-daughter, without regard to legitimacy, adoption, or step- relationship.
Prohibited acts
Marriage, cohabitation, sexual intercourse, sexual contact
Penalties
Up to life imprisonment or up to $50,000 fine
Nebraska
Nebraska
Jurisdiction
Nebraska
Prohibited relationships
Between parents and children, grandparents and grandchildren of every degree, between brothers and sisters of the half as well as the whole blood, and between uncles and nieces, aunts and nephews. Extend to children and relations born out of wedlock or any person who sexually penetrates a minor stepchild.
Prohibited acts
Marriage, sexual penetration
Penalties
1y to 25y
Nevada
Nevada
Jurisdiction
Nevada
Prohibited relationships
Persons within degrees of consanguinity which make marriages incestuous and void.
Prohibited acts
Marriage, fornication, adultery
Penalties
2y to life imprisonment and $10,000 fine
New Hampshire
New Hampshire
Jurisdiction
New Hampshire
Prohibited relationships
Person know to be an ancestor, descendant, brother or sister (whole or half blood), and uncle, aunt, nephew, or niece without regard to legitimacy, stepchildren, and relationships of parent and child by adoption.
Prohibited acts
Marriage, cohabitation (under the representation of marriage), sexual intercourse
Penalties
10y to 20y
New Jersey
New Jersey
Jurisdiction
New Jersey
Prohibited relationships
When the actor is "related to the victim by blood or affinity to the 3rd degree" and the victim is at least 16 but less than 18 years old.
Underage sexual offences are increased in severity by a degree if also incestuous.
When the actor has "a legal duty for the care of a child or who has assumed responsibility for the care of a child who engages in sexual conduct which would impair or debauch the morals of the child is guilty of a crime of the second degree", child in this section being defined as less than 18 years old.
Consensual incest between people 18 years old or more is not a criminal offense.
Prohibited acts
Sexual penetration (2nd degree sexual assault) or sexual contact (4th degree criminal sexual contact). See Prohibited Relationships.
Penalties
At least 15y without parole (2nd degree sexual assault) or up to 18m (4th degree criminal sexual contact)
New Mexico
New Mexico
Jurisdiction
New Mexico
Prohibited relationships
Persons known to be parents and children (including grandparents and grandchildren of every degree), brothers and sisters of half and whole blood, uncles and nieces, aunts and nephews.
Prohibited acts
Marriage or sexual intercourse
Penalties
Up to 3y and $5,000 fine
New York
New York
Jurisdiction
New York
Prohibited relationships
Persons known to be related to him or her, whether through marriage or not, as an ancestor, descendant, brother or sister of either the whole or the half blood, uncle, aunt, nephew or niece. Half-blood uncle/niece marriages are valid pursuant to a 2014 State Court decision. See https://www.courthousenews.com/half-blood-uncle-niece-couples-endorsed-in-ny/
Prohibited acts
Marriage, sexual intercourse, oral sexual conduct, or anal sexual conduct
Penalties
10y to 25y
North Carolina
North Carolina
Jurisdiction
North Carolina
Prohibited relationships
Person that is grandparent or grandchild; parent or child or stepchild or adopted child; brother or sister of whole or half-blood; uncle aunt, nephew or niece.
Prohibited acts
Carnal intercourse
Penalties
10m to 182m
North Dakota
North Dakota
Jurisdiction
North Dakota
Prohibited relationships
Persons known to be within a degree of consanguinity which makes marriages void between: parents and children, including grandparents and grandchildren of every degree; brothers and sisters of the half as well as the whole blood; uncles and nieces of the half as well as the whole blood; aunts and nephews of the half as well as the whole blood; first cousins of the half as well as the whole blood (illegitimate and legitimate children and relatives).
Prohibited acts
Marriage, cohabitation, sexual activity
Penalties
Up to 5y and $10,000 fine
Northern Mariana Islands
Northern Mariana Islands
Jurisdiction
Northern Mariana Islands
Prohibited relationships
A person who is related either legitimately or illegitimately, as
(1) an ancestor or descendant of the whole or half blood;
(2) a brother or sister of the whole or half blood; or
(3) an uncle, aunt, nephew, or niece by blood
Prohibited acts
A person 18 years of age or older engages in sexual penetration
Penalties
Up to 5y and $2,000 fine
Ohio
Ohio
Jurisdiction
Ohio
Prohibited relationships
Actor is the victim's "natural or adoptive parent, step-parent guardian, custodian, or person in loco parentis of the other person".
Prohibited acts
Sexual conduct
Penalties
2y to 8y
Oklahoma
Oklahoma
Jurisdiction
Oklahoma
Prohibited relationships
Persons within degrees of consanguinity which make a marriage incestuous and void.
Prohibited acts
Marriage, fornication, adultery
Penalties
Up to 10y
Oregon
Oregon
Jurisdiction
Oregon
Prohibited relationships
Persons known to be related, legitimately or otherwise as Ancestors, descendants, or brother or sister of whole or half blood.
Prohibited acts
Marriage, sexual intercourse, deviate sexual intercourse
Penalties
Up to 20y and $375,000 fine
Pennsylvania
Pennsylvania
Jurisdiction
Pennsylvania
Prohibited relationships
Ancestor or descendant, a brother or sister of whole or half-blood, or an uncle, aunt, nephew, or niece of whole blood (blood relationships without regard to legitimacy, and relationship of parent and child by adoption).
Prohibited acts
Marriage, cohabitation, sexual intercourse
Penalties
Up to 10y
Puerto Rico
Puerto Rico
Jurisdiction
Puerto Rico
Prohibited relationships
Persons who have a relationship of kinship, by being ascendant or descendant, by consanguinity, adoption or affinity, or collateral by consanguinity or adoption, until the third degree, or by sharing or possessing physical custody or parental authority.
Prohibited acts
Sexual intercourse.
Penalties
50y (8y if the party promoting the conduct is a minor who has not turned 18 if prosecuted as an adult.)
Rhode Island
Rhode Island
Jurisdiction
Rhode Island
Prohibited relationships
No person shall marry his or her sibling, parent, grandparent, child, grandchild, stepparent, grandparents' spouse, spouse's child, spouse's grandchild, sibling's child or parent's sibling.
Consensual incest between people 16 years old or more is not a criminal offense.
Prohibited acts
Marriage
Penalties
None
South Carolina
South Carolina
Jurisdiction
South Carolina
Prohibited relationships
(1) A man with his mother, grandmother, daughter, granddaughter, stepmother, sister, grandfather's wife, son's wife, grandson's wife, wife's mother, wife's grandmother, wife's daughter, wife's granddaughter, brother's daughter, sister's daughter, father's sister or mother's sister; (2) A woman with her father, grandfather, son, grandson, stepfather, brother, grandmother's husband, daughter's husband, granddaughter's husband, husband's father, husband's grandfather, husband's son, husband's grandson, brother's son, sister's son, father's brother or mother's brother.
Prohibited acts
Carnal intercourse
Penalties
6m to 5y and $500 minimum fine
South Dakota
South Dakota
Jurisdiction
South Dakota
Prohibited relationships
Marriages between parents and children, ancestors and descendants of every degree, and between brothers and sisters of the half as well as the whole blood, and between uncles and nieces, or aunts and nephews, and between cousins of the half as well as of the whole blood, are null and void from the beginning, whether the relationship is legitimate or illegitimate and include such relationships that arise through adoption.
Prohibited acts
Mutually consensual sexual penetration
Penalties
Up to 15y and $30,000 fine
Tennessee
Tennessee
Jurisdiction
Tennessee
Prohibited relationships
Any person known to be natural parent, child, grandparent, grandchild, uncle, aunt, nephew, niece, stepparent, stepchild, adoptive parent, adoptive child or brother and sister of the half or whole blood.
Prohibited acts
Sexual penetration
Penalties
3y to 15y and up to $10,000 fine
Texas
Texas
Jurisdiction
Texas
Prohibited relationships
Person known to be ancestor or descendant by blood or adoption; current or former stepchild or stepparent; parent's brother or sister of the whole or half blood; brother or sister of the whole or half blood or by adoption; children of the actor's brother or sister of the whole or half blood or by adoption; the son or daughter of the actor's aunt or uncle of the whole or half blood or by adoption.
Prohibited acts
Sexual intercourse (any penetration of the female sex organ by the male sex organ), deviate sexual intercourse (any contact between the genitals of one person and the mouth or anus of another person with intent to arouse or gratify the sexual desire of any person)
Penalties
2y to 20y and up to $10,000 fine
United States Virgin Islands
United States Virgin Islands
Jurisdiction
United States Virgin Islands
Prohibited relationships
INCEST: Persons being within the degrees of consanguinity within which marriages are declared by law to be void (V.I. CODE ANN. TIT. 14, § 961);
VOID MARRIAGES:
(a) A marriage is prohibited and void from the beginning,
without being so decreed and its nullity may be shown in any collateral proceeding, when it is between-
(1) a man and his grandmother, grandfather's wife, wife's grandmother, father's sister, mother's sister, mother, stepmother, wife's mother, daughter, wife's daughter, son's wife, sister, son's daughter, daughter's daughter, son's son's wife, daughter's son's wife, wife's son's daughter, wife's daughter's daughter, brother's daughter or sister's daughter;
(2) a woman and her grandfather, grandmother's husband, husband's grandfather, father's brother, mother's brother, father, stepfather, husband's father, son, husband's son, daughter's husband, brother, son's son, daughter's son, son 's daughter's husband, daughter's daughter's husband, husband's son's son, husband's daughter's son, brother's son or sister's son; or
(3) any persons either of whom has been previously married and whose previous marriage has not been terminated by death or a decree of divorce.
(b) Any of such marriages may also be declared to have been null and void by judicial decree.
(V.I. CODE ANN. TIT. 16, § 1)
Prohibited acts
who knowingly intermarry with each other,
or who commit fornication or adultery with each other
Penalties
shall each be imprisoned for not more than 10 years.
Utah
Utah
Jurisdiction
Utah
Prohibited relationships
Person known to be ancestor, descendant, brother, sister, uncle, aunt, nephew, niece, or first cousin, without regard to whole or half blood relationship, legitimacy, parent and child by adoption, or relationship of stepparent and stepchild while the marriage creating the relationship of a stepparent and stepchild exists.
Prohibited acts
Sexual intercourse (not amounting to rape, rape of a child or aggravated sexual assault)
Penalties
Up to 5y and $5,000 fine
Vermont
Vermont
Jurisdiction
Vermont
Prohibited relationships
Persons for whom marriage are prohibited by state law.
Prohibited acts
Marriage, fornication
Penalties
Up to 5y and $1,000 fine
Virginia
Virginia
Jurisdiction
Virginia
Prohibited relationships
Persons for whom marriages are prohibited; relations with children and grandchildren.
Prohibited acts
Adultery or fornication
Penalties
1y to 10y and up to $2,500 fine (18 years of age or older); 5y to 20y and up to $100,000 fine (under 18 years of age)
Washington
Washington
Jurisdiction
Washington
Prohibited relationships
Persons known to be related to him or her, either legitimately or illegitimately, as an ancestor, descendant, brother, or sister of either the whole or the half blood.
Prohibited acts
1st degree incest: sexual intercourse; 2nd degree incest: Sexual contact
Penalties
1st degree incest: up to 10y and up to $20,000 fine; 2nd degree incest: up to 5y and up to $10,000 fine;
West Virginia
West Virginia
Jurisdiction
West Virginia
Prohibited relationships
Engaging with his or her father, mother, brother, sister, daughter, son, grandfather, grandmother, grandson, granddaughter, nephew, niece, uncle or aunt. The definition of parent and child includes adoptive and step.
Prohibited acts
Sexual intercourse (any act between persons involving penetration, however slight, of the female sex organ by the male sex organ or involving contact between the sex organs of one person and the mouth or anus of another person) or sexual intrusion (any act between persons involving penetration, however slight, of the female sex organ or of the anus of any person by an object for the purpose of degrading or humiliating the person so penetrated or for gratifying the sexual desire of either party)
Penalties
5y to 15y and $500 to $5,000 fine
Wisconsin
Wisconsin
Jurisdiction
Wisconsin
Prohibited relationships
Persons known to be blood relatives and such relative is in fact related in a degree within the marriage is prohibited by the law
Prohibited acts
Marriage or nonmarital sexual intercourse.
Penalties
Up to 40y and $100,000 fine
Wyoming
Wyoming
Jurisdiction
Wyoming
Prohibited relationships
Persons known to be an ancestor or descendant or a brother or sister of the whole or half blood, including relationships of parent and child by adoption, blood relationships without regard to legitimacy, stepparent and stepchild.
Prohibited acts
Sexual intrusion, sexual contact
Penalties
Up to 15y and $10,000 fine
| Jurisdiction | Prohibited relationships | Prohibited acts | Penalties |
| Alabama | Either legitimately or illegitimately: His ancestor or descendant by blood or adoption; or His brother or sister of the whole or half-blood or by adoption; or His stepchild or stepparent, while the marriage creating the relationship exists; or His aunt, uncle, nephew or niece of the whole or half-blood. | Marriage, intercourse | A Class C felony, punishable by a prison term of "...not more than 10 years or less than 1 year and 1 day..." and a fine of up to $15,000. |
| Alaska | Either legitimately or illegitimately: an ancestor or descendant of the whole or half blood; or a brother or sister of the whole or half blood; or an uncle, aunt, nephew, or niece by blood. | Sexual penetration (being 18 years of age or older) | A Class C felony, punishable by a prison term "between 1 to 5 years" and up to a $50,000 fine. |
| American Samoa | A person he knows to be: his ancestor or descendant by blood or adoption; or his stepchild or stepparent, while the marriage creating that relationship exists and while the stepchild is 18 years of age or less; or his brother or sister of the whole or half-blood; or his uncle, aunt, nephew, or niece of the whole blood. | Marriage, sexual intercourse, deviate sexual intercourse | A Class D felony, punishable by a prison term "not to exceed 5 years" and up to a $5,000 fine. |
| Arizona | Persons with degrees of consanguinity which makes marriage incestuous and void. These are: between parents and children, including grandparents and grandchildren of every degree between brothers and sisters of the one-half as well as the whole blood, and between uncles and nieces, aunts and nephews and between first cousins Exception: first cousins may marry if both are 65 years of age or older, and can prove to a superior court judge in the state that one of the cousins is unable to reproduce. | Marriage, intercourse (cited in state law as fornication), or adultery | A class 4 felony, with an imprisonment term ranging between 1 and 3 and three-quarter years, depending on the severity. |
| Arkansas | The person committing the act being at least 16 years of age, knowingly, and without regard to legitimacy, including blood relationships: An ancestor or a descendant; A stepchild or adopted child; A brother or sister of the whole or half blood; An uncle, aunt, nephew, or niece; or A stepgrandchild or adopted grandchild. | Marriage, sexual intercourse, or deviate sexual activity with a prohibited person. | A Class C felony punishable by imprisonment from 3 to 10 years for the first offense and a fine of up to $10,000. |
| California | Being 14 years of age or olderα, persons within degrees of consanguinity which make marriages incestuous and void, without regard to the legitimacy of the relationship. These are: Parents and children Ancestors and descendants of every degree Siblings of the half or whole blood Uncles or aunts & nieces or nephews | Marriage, sexual intercourse (cited in state law as fornication) or adultery | "...imprisonment in the state prison" (specific penalty not described by state law) Registration as a sex offender (for life until January 1, 2021; at least 20 years from date of conviction [if only serving probation] or date of release as of January 1, 2021) |
| Colorado | Ancestor or descendant, including a natural child, child by adoption, or stepchild, a brother or sister of the whole or half blood, or an uncle, aunt, nephew, or niece of the whole blood ("descendant" includes a child by adoption and a stepchild, but only if the person is not legally married to the child by adoption or the stepchild). | Marriage, sexual penetration, sexual intrusion, sexual contact | Incest: 2y to 6y and $2,000 (minimum) to $500,000 fine; Aggravated incest: 4y to 12 y and $3,000 (minimum) to $750,000 fine. A conviction for incest or aggravated incest will also result in a sentence of lifetime supervision, which means electronic tagging for life, under the Lifetime Supervision of Sex Offenders Act 1998, which also applies to incest, under Part 10 of Title 18 of the Colorado Revised Statutes. |
| Connecticut | Any person related within degrees specified in 46b-21; No man may marry his mother, grandmother, daughter, granddaughter, sister, aunt, niece, stepmother or stepdaughter, and no woman may marry her father, grandfather, son, grandson, brother, uncle, nephew, stepfather or stepson. "a person is guilty of sexual assault in the third degree when such person engages in sexual intercourse with another person whom the actor knows to be related to him or her within any of the degrees of kindred specified in the statute that specifies which relatives are prohibited from marrying one another." | Marriage; sexual intercourse | 1y to 5y and $5,000 fine |
| Delaware | Without regard to legitimacy or adoption, male & his child, parent, brother, sister, grandchild, niece or nephew, father's sister or brother, mother's sister or brother, father's wife, wife's child, child of his wife's son or daughter; female & her parent, child, brother, sister, grandchild, niece or nephew, father's sister or brother, mother's sister or brother, mother's husband, husband's child, child of her husband's son or daughter. | Sexual intercourse | Up to 1y and $2,300 fine |
| District of Columbia | Any person related to another person (not including the 4th degree of consanguinity); marriage void if between man with his grandmother, grandfather's wife, wife's grandmother, father's sister, mother's sister, mother, stepmother, wife's mother, daughter, wife's daughter, son's wife, sister, son's daughter, daughter's daughter, son's son's wife, daughter's son's wife, wife's son's daughter, wife's daughter's daughter, brother's daughter, sister's daughter; between woman with her grandfather, grandmother's husband, husband's grandfather, father's brother, mother's brother, father, stepfather, husband's father, son, husband's son, daughter's husband, brother, son's son, daughter's son, son's daughter's husband, daughter's daughter's husband, husband's son's son, husband's daughter's son, brother's son, sister's son. | Marriage, cohabitation, sexual intercourse | Up to 12y and $37,500 fine |
| Florida | Any person related by lineal consanguinity, or a brother, sister, uncle, aunt, nephew, or niece | Marriage, sexual intercourse (defined as the penetration of the female sex organ by the male sex organ, however slight; emission of semen is not required). | Up to 5y (up to 15y in some cases) and $5,000 fine |
| Georgia | Person known to be (by blood or marriage): (1) Father and child or stepchild; (2) Mother and child or stepchild; (3) Brother and sister of the whole blood or of the half blood; (4) Grandparent and grandchild; (5) Aunt and nephew; or (6) Uncle and niece. | Sexual intercourse | 10y to 30y |
| Hawaii | Persons within degrees of consanguinity or affinity within which marriage is prohibited. | Sexual penetration | Up to 5y |
| Idaho | Parents and children, ancestors and descendants of every degree, and between brothers and sisters of the half (1/2) as well as the whole blood, and between uncles and nieces, or aunts and nephews, are incestuous, and void from the beginning, whether the relationship is legitimate or illegitimate. | Marriage, sexual intercourse, adultery | Up to 15y. In the case the victim is under 18 years of age, up to life imprisonment |
| Illinois | Person related to other person as a (i) Brother or sister, either of the whole blood or the half blood; or (ii) Father or mother, when the child, regardless of legitimacy and regardless of whether the child was of the whole blood or half-blood or was adopted, was 18 years of age or over when the act was committed; or (iii) Stepfather or stepmother, when the stepchild was 18 years of age or over when the act was committed . | Sexual penetration | 2y to 10y and $25,000 fine (more if specified) |
| Indiana | Person known to be biological parent, child, grandparent, grandchild, sibling, aunt, uncle, niece, or nephew. | Sexual intercourse, deviate sexual conduct, marriage (unless valid where entered) | 1y to 6y (advisory) |
| Iowa | Legitimately or illegitimately: Person knows to be ancestor, descendant, brother or sister of whole or half blood, aunt, uncle, niece or nephew. | Sexual act | Up to 5y and $7,500 fine |
| Guam | An ancestor or descendant, a brother or sister of the whole or half blood or an uncle, aunt, nephew or niece of the whole blood. | Knowing marriage or cohabitation | Up to 1y |
| Kansas | Person known to be biologically related as parent, child, grandparent of any degree, grandchild of any degree, brother, sister, half-brother, half-sister, uncle, aunt, nephew, niece. | Marriage, sexual intercourse, sodomy | 5m-13m (simple), 31m-136m (aggravated) and/or up to $100,000 fine for either simple or aggravated. |
| Kentucky | Known ancestor, descendant, brother, or sister without regard to legitimacy, adoption, whole or half blood, or stepparent and stepchild. | Sexual intercourse or deviate sexual intercourse | 5y to life imprisonment |
| Louisiana | Ascendant or descendant, brother or sister, uncle or niece, aunt or nephew (with knowledge), related by consanguinity either whole or half blood | Marriage (unless married legally in another state) or sexual intercourse. | 5y to 30y |
| Maine | Persons known to be within the 2nd degree of consanguinity (woman and her father, grandfather, son, grandson, brother, brother's son, sister's son, father's brother or mother's brother; man and his mother, grandmother, daughter, granddaughter, sister, brother's daughter, sister's daughter, father's sister or mother's sister). | Sexual intercourse (any penetration of the female sex organ by the male sex organ) | Up to 5y and/or $5000 fine |
| Maryland | Persons who may not marry, within 3 degrees of lineal consanguinity or 1 degree of collateral consanguinity (an individual's grandparent, parent, child, sibling, grandchild, grandparent's spouse, spouse's grandparent, parent's sibling, stepparent, spouse's parent, spouse's child, child's spouse, grandchild's spouse, spouse's grandchild, or sibling's child). | Vaginal intercourse | 1y to 10y |
| Massachusetts | Persons within degrees of consanguinity which make marriages incestuous and void: Marriages between parents and children, ancestors and descendants of every degree, and between brothers and sisters of the half (1/2) as well as the whole blood, and between uncles and nieces, or aunts and nephews, are incestuous, and void from the beginning, whether the relationship is legitimate or illegitimate. | Marriage, sexual intercourse, sexual activities (including but not limited to, oral or anal intercourse, fellatio, cunnilingus, or other penetration of a part of a person's body, or insertion of an object into the genital or anal opening of another person's body, or the manual manipulation of the genitalia of another person's body) | Up to 20y |
| Michigan | Criminal sexual conduct in the 4th degree includes when the actors are related "by blood or affinity to the third degree." | Sexual contact | Up to 2y or a fine of up to $500 or both |
| Minnesota | Person "nearer of kin to the actor than first cousin…whether of the half or the whole blood, with knowledge of the relationship". | Sexual intercourse | Up to 10y |
| Mississippi | Person within degrees of consanguinity which make marriages incestuous and void due to blood. | Marriage or cohabitation, adultery or sexual intercourse | Up to 10y or $500 fine |
| Missouri | Persons known to be ancestor or descendant by blood or adoption; stepchild while the marriage creating the relationship exists; brother or sister of whole or half blood; or uncle, aunt, nephew, or niece of the whole blood. | Marriage, cohabitation, sexual intercourse, sexual contact | Up to 7y |
| Montana | Person known to an ancestor, a descendant, a brother or sister of the whole or half-blood, or a stepson or step-daughter, without regard to legitimacy, adoption, or step- relationship. | Marriage, cohabitation, sexual intercourse, sexual contact | Up to life imprisonment or up to $50,000 fine |
| Nebraska | Between parents and children, grandparents and grandchildren of every degree, between brothers and sisters of the half as well as the whole blood, and between uncles and nieces, aunts and nephews. Extend to children and relations born out of wedlock or any person who sexually penetrates a minor stepchild. | Marriage, sexual penetration | 1y to 25y |
| Nevada | Persons within degrees of consanguinity which make marriages incestuous and void. | Marriage, fornication, adultery | 2y to life imprisonment and $10,000 fine |
| New Hampshire | Person know to be an ancestor, descendant, brother or sister (whole or half blood), and uncle, aunt, nephew, or niece without regard to legitimacy, stepchildren, and relationships of parent and child by adoption. | Marriage, cohabitation (under the representation of marriage), sexual intercourse | 10y to 20y |
| New Jersey | When the actor is "related to the victim by blood or affinity to the 3rd degree" and the victim is at least 16 but less than 18 years old. Underage sexual offences are increased in severity by a degree if also incestuous. When the actor has "a legal duty for the care of a child or who has assumed responsibility for the care of a child who engages in sexual conduct which would impair or debauch the morals of the child is guilty of a crime of the second degree", child in this section being defined as less than 18 years old. Consensual incest between people 18 years old or more is not a criminal offense. | Sexual penetration (2nd degree sexual assault) or sexual contact (4th degree criminal sexual contact). See Prohibited Relationships. | At least 15y without parole (2nd degree sexual assault) or up to 18m (4th degree criminal sexual contact) |
| New Mexico | Persons known to be parents and children (including grandparents and grandchildren of every degree), brothers and sisters of half and whole blood, uncles and nieces, aunts and nephews. | Marriage or sexual intercourse | Up to 3y and $5,000 fine |
| New York | Persons known to be related to him or her, whether through marriage or not, as an ancestor, descendant, brother or sister of either the whole or the half blood, uncle, aunt, nephew or niece. Half-blood uncle/niece marriages are valid pursuant to a 2014 State Court decision. See https://www.courthousenews.com/half-blood-uncle-niece-couples-endorsed-in-ny/ | Marriage, sexual intercourse, oral sexual conduct, or anal sexual conduct | 10y to 25y |
| North Carolina | Person that is grandparent or grandchild; parent or child or stepchild or adopted child; brother or sister of whole or half-blood; uncle aunt, nephew or niece. | Carnal intercourse | 10m to 182m |
| North Dakota | Persons known to be within a degree of consanguinity which makes marriages void between: parents and children, including grandparents and grandchildren of every degree; brothers and sisters of the half as well as the whole blood; uncles and nieces of the half as well as the whole blood; aunts and nephews of the half as well as the whole blood; first cousins of the half as well as the whole blood (illegitimate and legitimate children and relatives). | Marriage, cohabitation, sexual activity | Up to 5y and $10,000 fine |
| Northern Mariana Islands | A person who is related either legitimately or illegitimately, as (1) an ancestor or descendant of the whole or half blood; (2) a brother or sister of the whole or half blood; or (3) an uncle, aunt, nephew, or niece by blood | A person 18 years of age or older engages in sexual penetration | Up to 5y and $2,000 fine |
| Ohio | Actor is the victim's "natural or adoptive parent, step-parent guardian, custodian, or person in loco parentis of the other person". | Sexual conduct | 2y to 8y |
| Oklahoma | Persons within degrees of consanguinity which make a marriage incestuous and void. | Marriage, fornication, adultery | Up to 10y |
| Oregon | Persons known to be related, legitimately or otherwise as Ancestors, descendants, or brother or sister of whole or half blood. | Marriage, sexual intercourse, deviate sexual intercourse | Up to 20y and $375,000 fine |
| Pennsylvania | Ancestor or descendant, a brother or sister of whole or half-blood, or an uncle, aunt, nephew, or niece of whole blood (blood relationships without regard to legitimacy, and relationship of parent and child by adoption). | Marriage, cohabitation, sexual intercourse | Up to 10y |
| Puerto Rico | Persons who have a relationship of kinship, by being ascendant or descendant, by consanguinity, adoption or affinity, or collateral by consanguinity or adoption, until the third degree, or by sharing or possessing physical custody or parental authority. | Sexual intercourse. | 50y (8y if the party promoting the conduct is a minor who has not turned 18 if prosecuted as an adult.) |
| Rhode Island | No person shall marry his or her sibling, parent, grandparent, child, grandchild, stepparent, grandparents' spouse, spouse's child, spouse's grandchild, sibling's child or parent's sibling. Consensual incest between people 16 years old or more is not a criminal offense. | Marriage | None |
| South Carolina | (1) A man with his mother, grandmother, daughter, granddaughter, stepmother, sister, grandfather's wife, son's wife, grandson's wife, wife's mother, wife's grandmother, wife's daughter, wife's granddaughter, brother's daughter, sister's daughter, father's sister or mother's sister; (2) A woman with her father, grandfather, son, grandson, stepfather, brother, grandmother's husband, daughter's husband, granddaughter's husband, husband's father, husband's grandfather, husband's son, husband's grandson, brother's son, sister's son, father's brother or mother's brother. | Carnal intercourse | 6m to 5y and $500 minimum fine |
| South Dakota | Marriages between parents and children, ancestors and descendants of every degree, and between brothers and sisters of the half as well as the whole blood, and between uncles and nieces, or aunts and nephews, and between cousins of the half as well as of the whole blood, are null and void from the beginning, whether the relationship is legitimate or illegitimate and include such relationships that arise through adoption. | Mutually consensual sexual penetration | Up to 15y and $30,000 fine |
| Tennessee | Any person known to be natural parent, child, grandparent, grandchild, uncle, aunt, nephew, niece, stepparent, stepchild, adoptive parent, adoptive child or brother and sister of the half or whole blood. | Sexual penetration | 3y to 15y and up to $10,000 fine |
| Texas | Person known to be ancestor or descendant by blood or adoption; current or former stepchild or stepparent; parent's brother or sister of the whole or half blood; brother or sister of the whole or half blood or by adoption; children of the actor's brother or sister of the whole or half blood or by adoption; the son or daughter of the actor's aunt or uncle of the whole or half blood or by adoption. | Sexual intercourse (any penetration of the female sex organ by the male sex organ), deviate sexual intercourse (any contact between the genitals of one person and the mouth or anus of another person with intent to arouse or gratify the sexual desire of any person) | 2y to 20y and up to $10,000 fine |
| United States Virgin Islands | INCEST: Persons being within the degrees of consanguinity within which marriages are declared by law to be void (V.I. CODE ANN. TIT. 14, § 961); VOID MARRIAGES: (a) A marriage is prohibited and void from the beginning, without being so decreed and its nullity may be shown in any collateral proceeding, when it is between- (1) a man and his grandmother, grandfather's wife, wife's grandmother, father's sister, mother's sister, mother, stepmother, wife's mother, daughter, wife's daughter, son's wife, sister, son's daughter, daughter's daughter, son's son's wife, daughter's son's wife, wife's son's daughter, wife's daughter's daughter, brother's daughter or sister's daughter; (2) a woman and her grandfather, grandmother's husband, husband's grandfather, father's brother, mother's brother, father, stepfather, husband's father, son, husband's son, daughter's husband, brother, son's son, daughter's son, son 's daughter's husband, daughter's daughter's husband, husband's son's son, husband's daughter's son, brother's son or sister's son; or (3) any persons either of whom has been previously married and whose previous marriage has not been terminated by death or a decree of divorce. (b) Any of such marriages may also be declared to have been null and void by judicial decree. (V.I. CODE ANN. TIT. 16, § 1) | who knowingly intermarry with each other, or who commit fornication or adultery with each other | shall each be imprisoned for not more than 10 years. |
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- Tex. Penal Cod. § 25.02 and § 12-33 in Texas Penal Code, Title 3, Chapter 12, Subchapter Ahttp://codes.lp.findlaw.com/txstatutes/PE/6/25/25.02
- Utah Code § 76-7-102 and Ave Mince-Didier, Utah Felony Crimes by Class and Sentenceshttp://law.justia.com/codes/utah/2006/title76/76_09004.html
- 13 V.S.A. § 205http://law.justia.com/codes/vermont/2012/title13/chapter5/section205
- Va. Code § 18.2-361, 18.2-366 and Ave Mince-Didier, Virginia Felony Crimes by Class and Sentenceshttps://law.lis.virginia.gov/vacode/18.2-361/
- ARCW § 9A.64.020 and 9A.20.021 in Chapter 9A.20 RCW, Washington State Legislaturehttp://app.leg.wa.gov/RCW/default.aspx?cite=9A.64.020
- W. Va. Code § 61-8-12http://www.legis.state.wv.us/wvcode/ChapterEntire.cfm?chap=61&art=8§ion=12
- Wis. Stat. §944.06 Wis. Stat. §948.06http://www.legis.state.wv.us/wvcode/ChapterEntire.cfm?chap=61&art=8§ion=12
- Wyo. Stat. § 6-4-402 in ARTICLE 4, Title 6, Wyoming Statuteshttps://web.archive.org/web/20150120094259/http://legisweb.state.wy.us/statutes/statutes.aspx?file=titles/Title6/T6CH4AR4.htm
- People v. Tobiashttps://law.justia.com/cases/california/supreme-court/4th/25/327.html