
Marrying one's sibling-in-law is generally not considered a social taboo, and in some cultures, it is even encouraged. A sibling-in-law is the spouse of one's sibling or the sibling of one's spouse. While such marriages are not considered incestuous in most cultures and legal systems, there are exceptions. For example, 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. In New York, marriages between individuals related by blood within certain degrees of consanguinity are prohibited and considered incestuous and void. However, if the individuals are related by blood but are not closely related, the union may not be illegal.
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What You'll Learn

Co-parents-in-law can marry in some jurisdictions
In some jurisdictions, co-parents-in-law can legally marry, even if their respective children are already married, as this would make those children step-siblings. For example, in England and Wales, a husband's father and a wife's mother can marry, and this is also permitted in Canada unless the couple falls within the Marriage (Prohibited Degrees) Act, S.C. 1990, c. 46.
However, the order of marriages matters. If the parents marry first, their respective children become step-siblings, and then the children decide to marry, this is not allowed. But, if the children marry first, and then the parents marry, this is permitted.
The legality of such marriages may depend on specific circumstances and local laws, and it is always recommended to seek legal counsel for specific situations.
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Step-siblings cannot marry
The definition of a step-sibling is when two individuals have no parents in common, but their parents are married to each other. For example, if your mother marries a second time, and her new husband already has a daughter from a previous marriage, that daughter is your step-sister.
Step-siblings are considered related by marriage, and in some jurisdictions, step-siblings are considered to be related "as brother and sister through marriage". As such, in many places, step-siblings are not allowed to marry. For example, in Canada, no person shall marry another person if they are related as a brother or sister, including by adoption.
However, in some jurisdictions, it is legal for step-siblings to marry. For example, in England and Wales, it is legal for step-siblings to marry. Additionally, in some places, there is a loophole where if two people are already married, it is allowed for their parents to marry, thus making the married couple step-siblings.
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In-law relationships are by marriage, not blood
In-law relationships are formed by marriage, not by blood. This means that the relationship is established through one's spouse. For example, your mother-in-law is the mother of your spouse, and your brother-in-law is your sibling's spouse.
If your mother married her brother-in-law, this would mean that her new spouse is the brother of your father or the brother of your previous spouse (if you are divorced). This would make this person your stepfather or your former spouse's stepfather, respectively.
In some jurisdictions, it is legal for co-parents-in-law to marry, even if it would make their respective married children step-siblings. For example, in England and Wales, it is legal for a husband's father and a wife's mother to marry. However, step-siblings cannot marry, as they are considered siblings by law in many places.
In-law relationships can be complex, and the terminology can vary depending on the specific family dynamics. It is important to note that in-law relationships are established through marriage, and the specific terms used to describe these relationships may differ based on cultural and regional variations.
In summary, in-law relationships are formed through marriage, and the specific terms used to describe these relationships may vary depending on the specific family structure and cultural context.
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In-law problems are common, including control and interference
In-law problems are common, and it is not unusual for individuals to experience issues with their in-laws, including control and interference. In-laws may struggle to respect their child's marriage, leading to feelings of insecurity and resentment in the couple. This can cause a breakdown in trust and communication, as the couple tries to protect their relationship from their in-laws' influence.
In some cultures, there is a strong emphasis on family and community, and in-laws may feel responsible for guiding and supporting a newlywed couple. While this is often well-intentioned, it can lead to unwanted interference. For example, in India, the concept of joint families means that newlyweds often live with their in-laws, making it difficult to establish boundaries and maintain privacy. In-laws may also use financial support as a means to exert control, offering money or housing in exchange for a say in how the couple runs their lives.
In-laws may also interfere in their child's marriage by questioning or overriding parenting decisions, undermining the authority of the parents. This can cause confusion for the children and strain the couple's relationship. It is important to establish clear boundaries with in-laws early on in the marriage and to present a unified front, making it clear that certain decisions are not up for debate. Couples should also be consistent in enforcing these boundaries and limit their interactions with in-laws if they continue to violate them.
It is worth noting that in-law problems are not limited to one gender. While girls may feel disturbed and frustrated by in-law interference, boys can also face challenges, particularly if they feel their independence and decision-making ability are being undermined.
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Blended families may face deeper conflicts
Blended families, such as those formed when a mother marries her brother-in-law, can present unique challenges and conflicts. While creating a harmonious and peaceful home is possible, it requires effort and patience from all involved.
One of the key challenges is the clash of different parenting styles and family cultures. When two families unite, there may be a disparity in rules and discipline approaches, leading to confusion and resentment among children. It is crucial for parents to discuss their philosophies, reach a consensus on key issues, and present a united front. This includes agreeing on values they want to instil and household rules that honour everyone's beliefs.
Additionally, blended families may experience complex emotions and relationship-building difficulties. Children may struggle with accepting the new family dynamic, especially if they feel pressured to instantly love and care for all new members. Open communication is essential, and parents should encourage children to express their true feelings without judgment. It takes time and active effort to build relationships with step-parents and step-siblings, and it is normal to experience a range of emotions during this process.
The presence of ex-spouses can also impact the dynamics of a blended family. High-conflict ex-partners can create a stressful environment, especially if they criticise new spouses or involve children in their issues. In such cases, co-parenting work and therapy may be necessary to resolve conflicts and create a more peaceful environment for the children.
Furthermore, the insider/outsider dynamic can be challenging for stepparents, who may struggle to navigate their role as a friend or disciplinarian to their stepchildren. It is important for stepparents to set personal boundaries and maintain their respect while building relationships with their stepchildren.
Overall, blended families face a unique set of challenges and conflicts. By acknowledging these challenges, seeking professional help when needed, and committing to open communication, empathy, and patience, families can successfully navigate these difficulties and forge stronger bonds.
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Frequently asked questions
No, it is not legal for a person to marry their brother-in-law in New York, as it is considered incest. However, in some cultures like Judaism, there was a custom of yibbum, which allowed a man to marry his deceased brother's childless widow.
The brother-in-law is the spouse's sibling or the sibling's spouse. In this case, the brother-in-law is your mom's spouse's (your dad's) sibling.
A marriage that is void is invalid from the beginning. If the couple is related by blood within certain degrees of consanguinity, the marriage is illegal and void. The participants in such marriages may be fined and imprisoned.




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