
Your brother's brother-in-law is your sister-in-law's brother. They are not directly related to you, and you are not obliged to call them anything specific. However, they can be referred to as a co-sibling or co-brother-in-law.
| Characteristics | Values |
|---|---|
| Relationship | Brother's brother-in-law |
| How Related | Related by marriage |
| Alternative Names | Co-brother-in-law, co-sibling |
| Relation to You | No direct relation |
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What You'll Learn

Brother-in-law
The brother of your spouse is your brother-in-law. Therefore, your brother's brother-in-law is your brother's spouse's brother. In other words, this person is your sister-in-law's brother.
Your brother's brother-in-law is not directly related to you, and some people may refer to him as their co-brother-in-law. This term is used to describe the brother of the spouse of one's sibling. In Indian English, the term co-sibling is used to describe this relationship.
The term 'brother-in-law' is also used to describe the reciprocal relationship between a person's spouse and their sibling's spouse. For example, your brother's wife is your sister-in-law, and her brother is your co-brother-in-law.
It is worth noting that the use of the term 'brother-in-law' in this context is considered uncommon by some sources.
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Co-brother-in-law
The term "co-brother-in-law" refers to a male relative of one's generation, separated by two degrees of marriage. In other words, it is the brother of the spouse of one's sibling. For example, if your brother marries someone, that person is your sister-in-law, and her brother is your co-brother-in-law.
The term "co-sibling" is used in Indian English to describe a similar relationship. 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. These terms acknowledge that you are sharing the in-law relationship with your spouse.
It is important to note that these terms describe relationships that are not directly related by blood. Instead, they are types of kinship called affinity, which are relationships by marriage.
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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. This means that your brother's brother-in-law is your co-brother.
In this context, the term "sibling-in-law" refers to the spouse of one's sibling or the sibling of one's 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. For example, your brother's wife is your sister-in-law, and your husband's brother is your brother-in-law.
It is important to note that siblings-in-law, including co-siblings, are related by a type of kinship called affinity, which is a relationship by marriage rather than blood. As a result, the children of one's siblings-in-law are referred to as nieces and nephews, with the specification of "by marriage" if necessary.
The term "co-sibling" acknowledges the shared nature of the in-law relationship between spouses and their respective siblings. For example, your spouse's brother's wife is your co-sister-in-law, as you and your spouse share the relationship with her as your sister-in-law. Similarly, your husband's brother is your co-brother-in-law, as you both share the relationship with him as your brother-in-law.
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Co-sister-in-law
Your brother's brother-in-law is your co-brother-in-law. The term "co-sibling-in-law" refers to the reciprocal relationship between a person's spouse and their sibling's spouse. In other words, if your brother marries someone, that person is your sister-in-law, and her siblings are your co-sister-in-law or co-brother-in-law, depending on their gender.
The term "co-sister-in-law" is specifically used for the wife of one's co-sibling-in-law. This term is used to indicate that you share the "sister-in-law" relationship with your spouse or partner. For example, your husband's brother's wife is your co-sister-in-law. Similarly, your wife's brother's wife is also your co-sister-in-law. In this case, you are sharing the relationship with your wife.
The term "co-sibling" is commonly used in Indian English to refer to this type of relationship. It is important to note that these relationships are not related to a person directly by blood but rather through marriage. The children of one's co-siblings-in-law are simply referred to as nieces and nephews, with the specification of "by marriage" if necessary.
It is worth mentioning that the use of the term "brother-in-law" to refer to the brother of one's spouse's sibling is considered uncommon by some sources. In such cases, the relationship might be described as "my sister-in-law's brother" to indicate that the brother is not directly related to you but rather through your sister-in-law.
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No relation
There is no clear consensus on what to call your brother's brother-in-law when there is no relation. Some people suggest that you refer to them as "my brother-in-law" in casual conversation, especially if you are close. However, others argue that this is awkward and inaccurate, and that there is no relation between you and your brother's brother-in-law. In this case, you could simply refer to them as "a friend".
It is important to note that the term "in-law" indicates a relationship by marriage and not by blood. So, if your brother's spouse has a brother, they are not technically your in-law. However, some people choose to use the term "co-brother-in-law" or "co-sister-in-law" to describe this type of relationship. This term acknowledges that you are sharing the relationship with your brother or sister-in-law through your spouse.
Ultimately, there is no single correct answer to this question. The terminology you use will depend on your personal preference and the nature of your relationship with your brother's brother-in-law. If you need to clarify the relationship, you can always use additional words, such as "my brother's wife's brother" or "my sister-in-law's brother". These phrases accurately describe the connection without implying a closer relationship than may exist.
It is worth mentioning that family relationships can be complex and fluid. Just because there is no blood relation, it does not mean that you cannot consider your brother's brother-in-law as family. You may develop a close bond and choose to refer to each other as brother-in-law, or create your own unique term of endearment. The most important thing is to respect each other's boundaries and comfort levels when it comes to family terminology.
In conclusion, while there is no universally accepted term for your brother's brother-in-law when there is no relation, you have several options to choose from. You can use formal and accurate phrases like "my brother's wife's brother" or adopt more casual terms like "brother-in-law" or "co-brother-in-law". Alternatively, you can keep it simple by referring to them as a friend. The choice depends on your personal preference, the nature of your relationship, and how you want to define your extended family dynamics.
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Frequently asked questions
Your brother's brother-in-law is your co-brother-in-law. In other words, he is your sister-in-law's brother.
Your brother's sister-in-law is your co-sister-in-law. This means that you share the "sister-in-law" relationship with your brother.
Your brother's wife is your sister-in-law.











































