
A sibling-in-law is the spouse of one's sibling or the sibling of one’s spouse. In common usage, a sibling-in-law is referred to as a brother-in-law if male or a sister-in-law if female. There is no commonly used name for the relationship between a person and the sibling of their sibling-in-law. In this case, one would typically say my brother-in-law's brother or my brother-in-law's sister.
| Characteristics | Values |
|---|---|
| Relationship | Brother-in-law's brother or co-brother-in-law |
| Commonly used name | No |
| Alternative names | Brother-in-law, friend |
| Relation by blood | No |
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No technical term
There is no universally agreed-upon term for the relationship between your brother-in-law's siblings and yourself. In general, people refer to their brother-in-law's siblings as simply their "brother" or "sister". This is because the relationship is not one of direct blood relation, and there is no need to specify the precise nature of the connection unless it is relevant to the conversation.
In some cultures, there are specific terms for these types of relationships. For example, in Indian English, the wife of one's sibling-in-law is called a "co-sister", and the husband of one's sibling-in-law is called a "co-brother".
Some people may refer to their brother-in-law's siblings as their "co-brother-in-law" or "co-sister-in-law", but this usage is considered uncommon. Ultimately, the specific terminology used to describe these relationships is flexible, and people can choose the words that best suit their purpose and the context of the conversation.
It is worth noting that, while there may not be a widely accepted technical term for the relationship between your brother-in-law's siblings and yourself, these individuals are still considered in-laws and are related to you by a type of kinship called affinity, just like all other in-law relationships.
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Brother/sister-in-law
A sibling-in-law is the spouse of one's sibling or the sibling of one’s spouse. In common usage, 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. This also refers to the reciprocal relationship between a person's spouse and their sibling's spouse. For example, if you are a man, your brother-in-law's sister would be your sister-in-law.
In Indian English, the term "co-sibling" is used to refer to a sibling-in-law, specifically "co-sister" for the wife of one's sibling-in-law and "co-brother" for the husband of one's sibling-in-law. Similarly, 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.
It is worth noting that there is no commonly used name for the relationship between a person and their sibling-in-law's sibling. In such cases, one would typically refer to the person as "my brother-in-law's brother" or "my sister-in-law's sister". If there is a need to specify the precise nature of the relationship, one could use terms such as by marriage, "by blood", or "by adoption".
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Co-sibling
The term "co-sibling" is used in Indian English to refer to the reciprocal relationship between a person's spouse and their sibling's spouse. Specifically, a co-sister refers to the wife of one's sibling-in-law, and a co-brother refers to the husband of one's sibling-in-law.
For example, if we consider two pairs of siblings, A and B, and C and D, where A is married to C, and B is married to D, then A and C are co-siblings, and B and D are co-siblings.
In this context, the brother of your brother-in-law or the brother of your sister-in-law is not considered a co-sibling, as they are not the spouse of your sibling or the sibling of your spouse. They are simply referred to as your brother-in-law's brother or your sister-in-law's brother.
It is worth noting that while the terms "co-sister" and "co-brother" are used in Indian English, there is no commonly used term for this type of relationship in other varieties of English. In general, it is more common to refer to a male sibling-in-law as a "brother-in-law" and a female sibling-in-law as a "sister-in-law", without making a distinction between the spouse of one's sibling and the sibling of one's spouse.
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Co-brother/co-sister
The term "co-brother" or "co-sister" is used in Indian English to refer to the husband or wife of one's sibling-in-law. In other words, it is the spouse of your brother-in-law or sister-in-law. For example, if your brother is married to a woman, her brother would be your co-brother. Similarly, if your sister is married to a man, his sister would be your co-sister.
It is worth noting that there is no commonly used term in English for this type of relationship. In general, you would refer to your brother-in-law's brother or your sister-in-law's sister simply as your brother-in-law or sister-in-law. This is because they are related to you by marriage, even if there is no direct blood relation.
Some people may choose to use terms like co-brother-in-law or brother-in-law's brother to provide more precision when describing these types of relationships. However, this can become quite cumbersome and confusing, especially in more complex family structures.
In the end, the choice of terminology depends on personal preference and the level of detail one wishes to convey in describing the relationship. If a more precise term is needed, one could use "co-brother" or "co-sister" in addition to, or instead of, the more common terms like "brother-in-law" or "sister-in-law".
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No relation
If you are not related by blood, your brother-in-law's siblings are not related to you. For example, if your brother's wife's brother is not related to you, then her brother is also not related to you. Your brother-in-law's siblings are only related to you by marriage, and not by blood.
In some cultures, it is common for one pair of siblings to marry another pair of siblings. In such cases, the siblings-in-law are doubly related, both through their spouse and through their sibling. However, this does not mean that you are related to your brother-in-law's siblings if you are not already related to them through another relationship.
While your brother-in-law's siblings may become part of your family by association and affection, they are not legally considered your relatives. When a reference asks for "no relatives," it typically refers to someone who is not related to you by blood or marriage, such as a tutor, former employer, or youth worker.
It is important to note that the definition of "relative" can vary across different cultures and regions. What may be considered acceptable in one culture may not be accepted in another. Therefore, it is essential to consider the cultural context when determining the relationship between individuals.
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Frequently asked questions
There is no commonly used name for this connection. You could refer to them as "my brother-in-law's siblings". If you wanted to be more specific, you could say something like "my brother-in-law's brother" or "my sister-in-law's sister".
If you are very close, you could refer to them as your "brother-in-law" or "sister-in-law" in casual conversation, or simply as a "friend".
In Indian English, the terms "co-sister" and "co-brother" are used to refer to the wife of one's sibling-in-law and the husband of one's sibling-in-law, respectively.
The children of your brother-in-law's siblings would be your nieces and nephews "by marriage".
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 Judaism, there was also the custom of yibbum, where a man had a non-obligatory duty to marry his deceased brother's childless widow.











































