
Marrying a brother-in-law is not illegal as long as there is no blood relation involved. In New York, for example, individuals who are related within certain degrees of consanguinity are prohibited from marrying each other. This means that it is illegal for a person to marry a brother, sister, uncle, aunt, niece, or nephew. However, since a brother-in-law is not a blood relative, it is legal to marry them in New York. While it may be considered taboo by some, marrying a brother-in-law is not uncommon, and there are even passages in the Bible that mention marrying a brother-in-law.
| Characteristics | Values |
|---|---|
| Legality | Depends on the state law and the degree of consanguinity |
| Blood relation | Not a blood relative |
| State-specific law | New York prohibits incestuous marriages and void marriages |
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What You'll Learn

Marriage laws vary by state
Marriage laws vary from state to state in the US. While the general regulation of marriage is a matter of state law, the federal government imposes some constraints. For example, the Supreme Court's decision in Loving v. Virginia ended racial segregation in marriage across the nation, and federal law controls the states' regulation of marriage in this regard. The states' power to regulate marriage is also limited in matters within the scope of the Bill of Rights, such as the equal protection clause of the Fourteenth Amendment.
Each state has its own specific marriage laws, and these laws can differ in several ways. For instance, some states have waiting periods before a couple can get married, ranging from two or three days in Maryland, Louisiana, and Texas, to five days in Minnesota. Only Colorado mandates premarital counseling, but California and Arizona require it for minors. Some states, like Oklahoma, Texas, and Tennessee, will discount or waive the marriage license fee if the couple attends marriage counseling.
Additionally, while all states have incest prohibitions, these can vary. Generally, marriage between siblings and first cousins is prohibited, but the specific relationships covered by these laws may differ by state. For example, in New York, blood relatives are prohibited from marrying, but as your sister-in-law's brother is not a blood relative, such a marriage would be allowed.
Furthermore, the laws on marriage and property owned during marriage vary from state to state, which can complicate matters during a divorce or the death of a spouse. While most states are common-law property states, where each spouse owns their personal property and can own joint or separate property with their spouse, there is no marital community, and thus no marital property. However, the specific laws and regulations regarding property ownership during marriage can differ between states.
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No blood relation
Marriage laws vary depending on the jurisdiction. In New York, individuals who are closely related by blood are prohibited from marrying each other. This includes siblings, half-siblings, parents, grandparents, aunts, uncles, nieces, and nephews. Such marriages are considered incestuous and void, even if the appropriate licenses were obtained and a ceremony was performed. However, if individuals are related by blood but are not closely related, the marriage may not be illegal.
In England and Wales, it is legal to marry your co-parent-in-law. This is because the law only considers genetic relationships and not relationships created by marriage. For example, if a husband's father marries a wife's mother, their respective children will become step-siblings, but they are not genetically related, so it is legal.
In general, it is important to consult the specific marriage laws in your jurisdiction to determine if there are any prohibitions related to marrying a brother-in-law, especially if there is no blood relation involved. It is always advisable to seek legal advice from a licensed attorney or solicitor in your area to ensure you have accurate and up-to-date information regarding your specific situation.
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Incest is illegal
Marrying one's brother-in-law is not explicitly illegal, as long as there is no direct blood relation. However, incest, or sexual relations between close family members, is illegal in many places.
In New York, for example, while people generally have the right to marry the person of their choice, there are some scenarios where marriage is impermissible. Under New York Domestic Relations Law, individuals who are related within certain degrees of consanguinity are prohibited from marrying each other. This means that it is illegal for a person to marry their brother, sister, uncle, aunt, niece, or nephew. Such marriages are incestuous and void, and are considered invalid from the beginning. This is true regardless of whether there was a ceremony performed by an authorized person and whether the appropriate licenses were obtained.
In addition to incestuous marriages, marriages that are void include marriages in which one person is already married to someone else and marriages that were solemnized by a person without the authority to do so. Those who solemnize such marriages or aid in their solemnization may be deemed guilty of a misdemeanor and may be fined or imprisoned.
While incestuous marriages are prohibited in New York, it is important to note that laws may vary across different states and countries. Therefore, it is always advisable to consult the specific laws and regulations of your jurisdiction to understand the legal implications of any marriage arrangement.
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Void marriages
Marrying your brother-in-law is generally prohibited as incestuous. However, this depends on the state law in question. For example, in New York, blood relatives are prohibited from marrying each other, but your brother-in-law is not a blood relative, so such a marriage would be allowed.
Now, a void marriage is a marriage that is unlawful or invalid under the laws of the jurisdiction where it is entered. A void marriage is invalid from the beginning and is generally treated under the law as if it never existed. In some jurisdictions, a void marriage must still be terminated by annulment. A marriage that is entered into in good faith but is later found to be void may be recognised as a putative marriage, and the spouses as putative spouses, with certain rights granted by statute or common law. Void marriages are distinct from marriages that can be cancelled at the option of one of the parties but are otherwise valid. Such a marriage is voidable and is subject to cancellation through annulment if contested in court.
A marriage may be void for several reasons. Firstly, if there is a pre-existing marriage by at least one of the parties, the subsequent marriage may constitute bigamy, which is a crime. Secondly, if one or both parties are under the age of marriage, the marriage is void. Thirdly, a marriage may be void if it is forbidden by statute, such as same-sex marriage (in some jurisdictions) or group marriage. Fourthly, a marriage may be void if it is incestuous, such as between an uncle and niece or an aunt and nephew. Fifthly, a marriage may be void if one of the parties has lost their civil rights, such as through the conviction of a crime.
In California, a voidable marriage is one that is not automatically void but will become invalid when a judge in Orange County enters a judgment of nullity. Grounds for a voidable marriage include the incapacity of one of the parties to consent to the marriage.
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New York marriage laws
Marrying one's brother-in-law is not explicitly mentioned in New York marriage laws. However, certain rules and requirements must be followed for a marriage to be considered valid in the state.
Firstly, a marriage is considered a contract in New York, and as such, it must meet specific criteria. Both parties must be over the age of 18 and have the mental capacity to enter into a contract. Marriages of minors under 18 are prohibited, although 16 and 17-year-olds can marry with parental consent, and 14 and 15-year-olds with court permission. Additionally, you cannot marry if you are already married to another living person, and you cannot marry anyone who is a close blood relative, such as a parent, sibling, aunt, uncle, niece, or nephew.
Secondly, to be valid, a marriage ceremony must be performed by an authorised individual. These include specific government officials, such as a city clerk or a judge, or a member of the clergy who has been granted authority by a governing church body. The officiant must be registered with the City of New York to perform the ceremony within the city limits.
It is important to note that marriages entered into outside of New York are generally valid in the state, and marriages performed in New York are typically recognised outside of the state. However, same-sex marriages, while permitted in New York, may not be considered valid in other states due to the federal Defense of Marriage Act.
Lastly, while a marriage ceremony is the typical route, a marriage can also be established in New York by signing a written contract of marriage witnessed by at least two people and acknowledged in front of a New York judge.
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Frequently asked questions
It depends on the state law. In New York, for example, it is illegal to marry a blood relative, but your brother-in-law is not a blood relative, so it would be legal.
Under New York Domestic Relations Law, individuals who are related within certain degrees of consanguinity are prohibited from marrying each other. This includes marriages between a brother and sister, uncle and niece, aunt and nephew, etc. Such marriages are considered incestuous and void.
A void marriage is one that is invalid from the beginning because it violates the law. Void marriages are unlawful, and there are no steps that need to be taken to terminate, dissolve, or annul them.
Participants in an incestuous marriage may be fined and/or imprisoned.
To obtain specific legal advice, you should contact an attorney who is licensed to practice law in your state.




































