
In general, a sibling-in-law refers to the spouse of one's sibling or the spouse of their sibling's spouse. While there are cultural variations, such as the Islamic and Jewish traditions prohibiting sexual relations between siblings-in-law, there is no legal prohibition against marrying a sibling-in-law in many places, as long as the individuals involved meet the legal requirements for marriage, such as being of legal age and having mental competence. From a cultural perspective, marrying a sibling-in-law may be considered unusual or socially unexpected, but as long as there is no blood relation, it is not incestuous.
| Characteristics | Values |
|---|---|
| Relationship | Brother-in-law is the spouse's sibling or the sibling's spouse |
| Cultural views | In Islamic and Jewish law, sexual relations between siblings-in-law are prohibited as incestuous unless the spouse is no longer married. |
| Cultural views | In Biblical times, it was customary to marry and take care of your deceased brother's wife. |
| Cultural views | In Indian culture, family is an important part of a married couple's life and can influence the decision to marry. |
| Legality | There is no prohibition against marrying a sister-in-law's brother as long as both parties are of legal age, mentally competent, and not presently married. |
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What You'll Learn
- There is no legal prohibition against marrying your sister-in-law's brother
- In Islamic law, sexual relations between siblings-in-law are prohibited as incestuous
- In Judaism, there was a custom of yibbum, where a man would marry his deceased brother's childless widow
- Marrying your brother's sister-in-law may be considered socially unusual
- Family members may disapprove of a marriage between your sister-in-law's brother and yourself

There is no legal prohibition against marrying your sister-in-law's brother
In general, there is no legal prohibition against marrying your sister-in-law's brother. While some cultures and religions may have different views and customs, it is not a direct blood relation, and therefore not considered incestuous in most societies. In Western cultures, the children of your siblings-in-law are referred to as nieces and nephews, and they are related to you by a type of kinship called affinity, which is the case for all in-law relationships.
In Islamic law (Sharia) and Jewish law (halakha), sexual relations between siblings-in-law are prohibited as incestuous unless the spouse is no longer married. However, in Judaism, there was a custom of yibbum, where a man had a non-obligatory duty to wed his deceased brother's childless widow. In Islamic cultures, there may be pressure not to marry your sister-in-law's brother to avoid causing trouble in the family.
In the United States, as long as you are of legal marrying age (18) or have parental permission, are not currently married, and are both mentally competent, you are free to marry your sister-in-law's brother.
While it may be considered unusual or awkward by some, there is no legal or blood-related reason that you cannot marry your sister-in-law's brother. It is important to consider cultural and familial expectations and potential challenges, especially in the case of inter-cultural marriages.
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In Islamic law, sexual relations between siblings-in-law are prohibited as incestuous
Islamic law, or Sharia law, prohibits sexual relations between siblings-in-law as incestuous. However, the specific scenario of a man marrying his sister-in-law is not explicitly mentioned in the Quran. While the Quran provides a list of women that a Muslim man is prohibited from marrying, including mothers, daughters, sisters, and relatives by milk or blood, it does not specifically address the case of a brother-in-law's sister.
In Islamic jurisprudence, the absence of a specific prohibition suggests that such a marriage may be permissible. The general ruling in the Quran indicates that marriages are allowed unless specifically prohibited. Additionally, in certain circumstances, a man can marry his brother's widow or divorced wife, as she is no longer considered a 'mehram' relative of the brother-in-law.
However, some Islamic scholars have interpreted the absence of a direct reference to a brother-in-law's sister as an indication that such a marriage is not allowed. They argue that the relationship between a man and his sister-in-law is analogous to that of a brother and sister, and therefore, their marriage would be considered incestuous. This interpretation is based on the understanding that the Quran prohibits marriages between close relatives to maintain family ties and prevent conflicts of interest.
It is important to note that Islamic law places great importance on the consent of both parties and the approval of their families. Marriages are often seen as unions between families, and compatibility between the families is considered crucial. In the case of a man wishing to marry his sister-in-law, familial relations and dynamics may become complex, and it is advised to carefully consider the potential impact on family relationships.
While the religious aspects of marriage are essential in Islam, it is also believed that Allah (swt) has a master plan for everything in life, including marriage. Muslims often seek guidance from Allah (swt) and trust in His will when it comes to matters of the heart and finding a suitable spouse. This spiritual aspect provides comfort and reassurance during challenging times, such as family disagreements or societal pressures regarding marriage.
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In Judaism, there was a custom of yibbum, where a man would marry his deceased brother's childless widow
In Judaism, there was a custom of yibbum, a form of levirate marriage where a man would marry his deceased brother's childless widow. This custom was based on the idea of providing an heir to perpetuate the name of the deceased brother, as mentioned in Deuteronomy 25:5–10. The oldest brother had the first right to perform this custom, and he would also inherit all of his late brother's property. It is important to note that both parties could refuse to go through with the marriage, but they had to perform a ceremony called halizah, which involved a symbolic act of renunciation of their right to marry each other.
The custom of yibbum was not an obligation, but it was encouraged to protect the widow and provide her with a new family, enhanced status, and financial resources. If the widow's brother-in-law refused to marry her, she was free to marry anyone she chose. Over time, Jewish law has seen a decline in the practice of yibbum, with most contemporary Jewish communities and Israel prohibiting it.
In modern times, there is no legal prohibition against marrying a sister-in-law's younger brother, as long as certain conditions are met. These conditions include being of legal marrying age (usually 18), having parental consent if underage, not being currently married, and being mentally competent.
While the custom of yibbum is no longer widely practised, it is an interesting aspect of Jewish history and provides insight into the social and cultural norms of the past.
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Marrying your brother's sister-in-law may be considered socially unusual
However, in other cultures, it may not be seen as socially unacceptable, as long as the individuals involved are not blood-related. For example, in some Indian communities, family plays a crucial role in the lives of married couples, and marrying a sister-in-law's brother may be frowned upon due to the potential for family dynamics to influence the couple's relationship.
From a legal standpoint, there does not appear to be a prohibition against marrying your sister-in-law's brother, assuming all other standard legal requirements for marriage are met, such as being of legal age, having mental competence, and not currently being married to someone else.
While it may be uncommon, it is essential to consider cultural, religious, and familial sensitivities when contemplating such a union. Open communication with one's family and in-laws is encouraged to navigate any potential social complexities. Ultimately, the decision to marry is a personal one, and as long as legal consent is obtained, societal perceptions should not deter two consenting adults from pursuing a life together.
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Family members may disapprove of a marriage between your sister-in-law's brother and yourself
Marriage is a sacred union that binds two individuals in a commitment of love and companionship. While the legal and cultural norms surrounding marriage vary across different societies, one consistent aspect is the expectation of familial support and blessing. However, in certain situations, family members may disapprove of a prospective marriage, particularly when it involves complex relational dynamics, such as marrying your sister-in-law's brother.
In some cultures and religious traditions, marrying a sister-in-law's brother may be perceived as unconventional or even socially unacceptable. This disapproval can stem from various factors, including cultural norms, religious beliefs, or traditional customs. For example, in Islamic law (Sharia) and Jewish law (halakha), sexual relations between siblings-in-law are prohibited as incestuous unless the previous marriage has ended.
Additionally, family members may have concerns about the potential impact on familial harmony and dynamics. Marrying a sister-in-law's brother can create intricate relational ties within the family, which some may view as potentially disruptive or complicated. It is essential to acknowledge that family members often have a significant influence on a married couple's life, and their disapproval can create tension and challenges in maintaining family relationships.
Furthermore, disapproval may arise from more personal factors, such as individual values, beliefs, or expectations within the family. For instance, if your family has specific ideas about the type of spouse you should marry, deviating from those expectations may lead to disapproval. In some cases, family members may worry about the potential for conflict or tension with your sister-in-law's family, especially if they do not approve of the union.
It is important to remember that while family approval is valuable, it should not be the sole determinant of your decisions. If you find yourself in a situation where your family disapproves of your desire to marry your sister-in-law's brother, open communication and seeking understanding can be crucial steps toward resolving their concerns. It may be helpful to involve other family members or trusted individuals who can mediate and facilitate constructive conversations between all parties.
Ultimately, the decision to marry your sister-in-law's brother is a personal one, and it is essential to carefully consider your feelings, values, and the potential impact on your relationships with your family members. While family disapproval can be challenging, navigating these complexities with empathy, honesty, and a willingness to engage in dialogue can help foster a more positive outcome for all involved.
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Frequently asked questions
Yes, there is no prohibition against this as long as both parties are of legal age (18) or have parental consent, are not presently married to someone else, and are mentally competent.
Marrying a sister-in-law's brother can cause trouble within an Indian family, but it is not prohibited.
No, Islamic law prohibits sexual relations between siblings-in-law as incestuous.
No, Jewish law prohibits sexual relations between siblings-in-law as incestuous.
While some people may find it unusual, it is not socially prohibited as they are not blood relatives.































