
The husband of your sister is your brother-in-law. However, some people disagree with this, stating that the husband of your sister is simply that and is in no way related to you legally. In Indian English, the husband of your sister-in-law is called a co-brother.
| Characteristics | Values |
|---|---|
| Relationship to you | Sister's husband |
| Relationship to your sister | Husband |
| Relationship to your spouse | N/A |
| Legal relationship to you | No |
| Family relationship to you | Yes |
| Cultural variations | Co-brother in Indian English |
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What You'll Learn

The husband of your sister is your brother-in-law
In-laws are people you are related to by marriage. So, your brother-in-law is the brother of your spouse, and your sister-in-law is your spouse's sister. Extending this logic, the husband of your sister (your sister-in-law) would be your brother-in-law. This is a common understanding of the term and is consistent with its broader definition.
However, some people draw a distinction here, arguing that the husband of their sister-in-law is not their brother-in-law because there is no direct legal relationship between them. They are connected only through marriage, and even then, it is a connection via their spouses being siblings, rather than a direct spousal connection. This is a narrower definition, often found in legal dictionaries, and it does not consider the husband of your sister-in-law to be your brother-in-law.
Ultimately, the term 'brother-in-law' is used to describe a person with whom you have a close affinity, and in many cultures, this term is used to describe the husband of your sister-in-law. In Indian English, for example, the husband of your sister-in-law is called a 'co-brother'. This term specifically refers to the husband of one's sibling-in-law, acknowledging the reciprocal nature of the relationship.
So, while the husband of your sister is generally considered your brother-in-law, there are nuances to this definition, and some people may not use the term in this broader sense.
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Your spouse's sister's husband is your brother-in-law
The term "brother-in-law" can be used to refer to two different relationships. Firstly, it can refer to the brother of one's spouse. Secondly, it can refer to the husband of one's sister. In the context of this question, we are considering the second definition.
So, if your spouse has a sister, she is your sister-in-law. And if your sister-in-law is married, her husband is, by extension, your brother-in-law. This relationship is based on affinity, a type of kinship that arises from marriage, rather than a direct blood relationship.
It's worth noting that some people may not consider their spouse's sister's husband as a true "in-law" since there is no legal relationship between them. However, in a broader sense of the term, he could still be referred to as a brother-in-law.
In some cultures, there are specific terms to describe these extended family relationships. For example, in Indian English, the husband of one's spouse's sister would be referred to as a "co-brother".
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Your sister-in-law's husband is not your brother-in-law
The husband of your sister-in-law is not your brother-in-law. Your sister-in-law's husband is simply your sister-in-law's husband. He has no direct relationship with you. The reason she is your sister-in-law is that it is expected that you and your spouse will have children, and those children will join your family tree as they will have ancestors that are also your ancestors. Your sister-in-law's husband will never have ancestors that are also your ancestors.
A sibling-in-law is the spouse of one's sibling or the sibling of one's spouse. In other words, a sibling-in-law is the brother or sister of your spouse. More commonly, a sibling-in-law is referred to as a brother-in-law for a male sibling-in-law and a sister-in-law for a female sibling-in-law.
The term "brother-in-law" can be used to refer to two different relationships: (1) the brother of your spouse, or (2) the husband of your sister. Similarly, "sister-in-law" can mean (1) the sister of your spouse, or (2) the wife of your brother.
In Indian English, the husband of your sibling-in-law (i.e. the spouse of your sibling) is referred to as a co-brother, and the wife of your sibling-in-law (i.e. the spouse of your spouse's sibling) is referred to as a co-sister. These terms acknowledge the reciprocal relationship between a person's spouse and their sibling's spouse.
While the husband of your sister-in-law may not be considered a brother-in-law in a strict legal sense, some people may use the term more broadly to include spouses of siblings-in-law as a way to indicate affinity or closeness within the extended family. Ultimately, the usage of terms like "brother-in-law" or "sister-in-law" can vary depending on personal preference and cultural context.
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Your siblings' spouses are your brothers-in-law
In some cultures, there are specific terms to refer to these relationships. For example, in Indian English, the wife of a male sibling-in-law is called a co-sister, and the husband of a female sibling-in-law is called a co-brother. In Arabic, there are also specific terms for these relationships: "عديل" and "سلفة".
It's worth noting that, in some cases, people may not consider their siblings' spouses as their brothers- or sisters-in-law. This may be due to personal preference or the level of closeness they feel with that person. Legally speaking, there is no direct relationship between a person and their sibling's spouse, and they are only connected by a legal affinity.
However, socially and culturally, it is common to refer to these individuals as brothers- or sisters-in-law, and they are considered part of the extended family. The children of one's siblings-in-law are simply called nieces and nephews, with the specification of "by marriage" if needed.
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Your brother-in-law's sister's husband is your co-brother
The term "brother-in-law" can be used to refer to two different relationships: your sister's husband or your spouse's brother. In this case, your brother-in-law's sister's husband is related to you by affinity, a type of kinship that connects in-laws. They are your co-brother, which is a term used in Indian English to refer to the husband of one's sibling-in-law. This relationship is not a direct blood relation, but rather a legal affinity.
While some people may refer to their brother-in-law's sister's husband as simply their "brother-in-law," others may choose to use a more specific term like "co-brother" or "my brother-in-law's sister's husband" to avoid confusion. Ultimately, the choice of terminology depends on personal preference and the context of the conversation.
It's worth noting that different languages and cultures have varying terms and relationships for extended family members. For example, in Arabic and Spanish, there are specific words to describe the spouse of one's spouse's sibling, whereas English has a broader definition of "brother-in-law" or "sister-in-law."
In summary, your brother-in-law's sister's husband is your co-brother, and while there may not be a precise legal definition, he is considered family through affinity or kinship. The specific terminology used to describe this relationship may vary depending on cultural and personal preferences.
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Frequently asked questions
Yes, your sister's husband is your brother-in-law.
A brother-in-law is the brother of your spouse or the husband of your sibling.
In Indian English, your sister's husband can be referred to as a co-brother.
Yes, in Arabic, the terms are عديل for a male in-law and سلفة for a female in-law.
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.











































