
The concept of marrying within one's in-laws is not uncommon. While it may be culturally taboo in some places, it is not illegal for individuals who are not blood relatives to marry. For example, a man can marry his wife's sister, and they would be considered siblings-in-law, not blood siblings. In some religions, there are circumstances in which a man is obliged to marry his deceased brother's wife.
| Characteristics | Values |
|---|---|
| Country | Australia |
| Marrying an in-law | Allowed, as long as it is not a sibling, direct ancestor or descendant, or a blood relative. |
| Age of marriage | 18 years or above |
| Age below 18 | Allowed to marry with the consent of parents, a relevant person, or a judge or magistrate |
| Same-sex marriage | Allowed |
| Polygamous marriages | Not allowed |
| Transsexual persons | Allowed |
| Country | New York |
| Marrying an in-law | Not allowed if the in-law is a close relative, including a brother, sister, uncle, aunt, niece, or nephew. |
| Country | India |
| Marrying an in-law | Allowed, but sexual relations between siblings-in-law are prohibited as incestuous, unless the spouse is no longer married. |
| Country | Judaism |
| Marrying an in-law | Custom of yibbum, where a man had a non-obligatory duty to wed his deceased brother's childless widow. |
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What You'll Learn
- In Australia, first cousins, aunts/uncles, and stepparents/stepchildren can marry
- Prohibited marriages in New York include siblings, uncles/aunts, nieces/nephews
- Void marriages include those between close blood relatives
- In Islamic and Jewish law, sexual relations between siblings-in-law are prohibited
- Marriage laws in Australia and Queensland require individuals to be of marriageable age

In Australia, first cousins, aunts/uncles, and stepparents/stepchildren can marry
In Australia, marriage laws differ from those in other countries, allowing for some unique relationships to be legally recognised. While it may be surprising to some, first cousins, aunts/uncles, and stepparents/stepchildren can, in certain circumstances, marry in Australia.
Firstly, let's examine the legality of cousin marriages in Australia. While it may be a topic of debate and vary across different cultures and personal beliefs, cousin marriages are generally legal in Australia. This is due to the absence of specific provisions within Australian legislation, including the federal Marriage Act 1961 and the Family Law Act 1975, prohibiting marriage between cousins. However, it is essential to approach such unions with caution, considering the potential health risks and seeking legal guidance to navigate federal and state regulations.
Moving on to aunts and uncles, it may be even more surprising that marriages between a person and their aunt or uncle are also permitted in Australia. This is because, according to the Marriage Act 1961, an "ancestor" refers specifically to a grandparent or great-grandparent, thus excluding aunts and uncles from the category of prohibited relationships. As a result, marriages between an individual and their aunt or uncle are legally recognised in the country.
Finally, let's discuss step-relationships. While the situation is more complex for stepparents and stepchildren, it is still possible for them to marry under certain conditions. In the scenario described, where a stepbrother and stepsister fall in love and want to marry, their parents' divorce would not change their legal status as step-siblings. Therefore, they would still be considered legally prohibited from marrying, even if their parents are no longer together. However, if a stepparent legally adopts their stepchild, they would then fall into the category of "ancestor or descendant," and marriage would be prohibited.
In summary, Australia has unique marriage laws that allow for marriages between first cousins, aunts/uncles, and stepparents/stepchildren in certain circumstances. It is important to approach these situations with sensitivity, considering cultural differences, family dynamics, and any legal or health implications that may arise.
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Prohibited marriages in New York include siblings, uncles/aunts, nieces/nephews
Marrying an in-law is a complex issue that varies across different jurisdictions. In New York, there are specific prohibitions in place regarding marriages between certain relatives. Under New York's Domestic Relations Law, individuals who are closely related by blood are prohibited from marrying each other. This includes siblings (full or half-blood), uncles/aunts, and nieces/nephews. Marriages between these relatives are considered incestuous and are void, meaning they are invalid from the beginning.
The law specifically prohibits marriages between a person and their uncle, aunt, niece, or nephew. This prohibition extends to half-uncles, half-aunts, half-nieces, and half-nephews, as well. These relationships are considered within the prohibited degrees of consanguinity, which refers to the closeness of blood relationship. Marrying within these degrees of consanguinity is illegal and may result in fines and imprisonment.
It is important to note that the prohibition on uncle-niece and aunt-nephew marriages was not always in place in New York. Until 1893, marriages between uncles and nieces or aunts and nephews were lawful. However, a prohibition was enacted, and now these marriages are considered incestuous and void. While there have been legal debates about the interpretation of the law, the current understanding is that these marriages are prohibited.
In addition to the prohibitions on marriages between uncles/aunts and nieces/nephews, New York law also prohibits marriages between ancestors and descendants, such as parents and children. Marriages between step-relatives, such as step-siblings or a step-parent and step-child, are also prohibited. These marriages are considered invalid, and sexual relations between such close family members are against the law.
While New York has strict laws prohibiting marriages between specific relatives, it is important to note that first cousins are allowed to marry in the state. Marriages between half-first cousins, first cousins once removed, second cousins, and more distant relatives are also recognised in New York. This may come as a surprise to some, as first cousin marriages are only permitted in about half of the U.S. states.
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Void marriages include those between close blood relatives
Marriage is a legal bond that brings with it certain rights and responsibilities for both partners. Marriage laws protect the fundamental rights of each partner in a marriage. Marriage is also a social union that brings with it rights such as affection, companionship, cohabitation, shared property rights, and sexual connections.
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. Void marriages include those between close blood relatives, which is referred to as consanguinity. The degree of consanguinity prohibited differs depending on the jurisdiction. For example, in New York, it is illegal for a person to marry a brother, sister, uncle, aunt, niece, or nephew. In Australia, marriages between siblings and direct ancestors or descendants are prohibited, but first cousins may marry. In India, the Hindu Marriage Act of 1955 prohibits marriages between cousins, aunts or uncles, and nieces or nephews.
Void marriages are distinct from voidable marriages, which can be ended at the option of one of the parties. Void marriages may require an annulment to remove any legal impediment to a subsequent marriage, but they are generally treated as if they never existed and require no formal action to terminate. Voidable marriages may result from factors such as impotence or coercion.
In addition to incestuous marriages, void marriages can also include bigamy, marriages solemnized by unauthorized individuals, and marriages where one party is under the age of consent.
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In Islamic and Jewish law, sexual relations between siblings-in-law are prohibited
In Islamic law, marriage is a sacred contract between a Muslim man and a Muslim woman. A Nikah ceremony requires the presence of the bride's wali (a male relative, preferably her father), two Muslim witnesses, the offering of Mahr (a gift from the groom to the bride), freedom from any Islamic legal obstacles, and mutual consent in the form of a verbal exchange.
Islamic law prohibits marriage between certain relatives, including one's mother, grandmother, daughter, granddaughter, sister, niece, great-niece, aunts, and great-aunts. Marriage is also forbidden between people who are related through these relatives. For example, a man cannot marry his wife's mother or daughter. Furthermore, Muslim men are permitted to marry members of the Kitabiyya, while Muslim women are forbidden from marrying non-Muslim men.
In Jewish law, marriage is also a contractual agreement between a Jewish man and a Jewish woman, officiated by a rabbi or another religious official. It consists of two parts: the betrothal ceremony (erusin or kiddushin) and the actual wedding ceremony (nissu'in or chupah).
Jewish law prohibits incestuous relationships, and the offspring of such marriages are considered illegitimate. While there is no explicit mention of step-sibling marriages, unions between step-siblings are generally discouraged due to social norms and the presumption that they belong to the same family unit.
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Marriage laws in Australia and Queensland require individuals to be of marriageable age
In Queensland, the marriageable age is the same as in the rest of Australia, with the additional stipulation that the person must be at least 16 years old for the court to consider granting permission to marry. The types of things that the court might consider include the length of the relationship with their partner. Until 1991, the marriage age in Queensland was 16 for females and 18 for males. However, a female aged 14 or 15 (wanting to marry a male aged 18 or above) or a male aged 16 or 17 (wanting to marry a female aged 16 or above) could apply to the court for permission to marry.
Australian law recognises only monogamous marriages, being marriages of two people, including same-sex marriages. This means that it is possible for first cousins to marry, for a person to marry an aunt or uncle, or a stepparent to marry a stepchild (provided there was no legal adoption). Marriages between siblings (of full or half-blood) and between a person and a direct ancestor or descendant are not permitted.
In addition to age requirements, there are other legal considerations for marriage in Australia. Marriages must be conducted by an authorised marriage celebrant, who must be physically present to solemnise the marriage, along with the parties and two witnesses. Couples must meet with their celebrant separately and in person before the marriage is solemnised. The celebrant must also submit the marriage paperwork to the registry of births, deaths, and marriages in the relevant state or territory within 14 days of the marriage.
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Frequently asked questions
Yes, it is legal to marry an in-law as long as there is no blood relationship.
In some religions, such as Catholicism, there may be restrictions or special considerations for marrying an in-law. It is important to consult with a religious leader or expert in canon law for specific guidance.
Marrying an in-law can have social implications and may be considered taboo in certain cultures or communities. It can impact family dynamics and relationships, and there may be social stigma or disapproval from family or friends.
Yes, a brother can marry his sister-in-law as they are not considered to be biologically related.
In certain situations, it may be appropriate and acceptable for a widow or widower to marry their deceased spouse's sibling, especially if there are young children to raise. This can provide emotional and practical support for the surviving spouse and their children.











































