
The brother of your brother-in-law is your sibling-in-law. This term refers to the reciprocal relationship between a person's spouse and their sibling's spouse. In Indian English, this can be referred to as a co-sibling. However, there is no widely recognised term for this relationship in Western cultures.
| Characteristics | Values |
|---|---|
| Relationship | Brother-in-law |
| Description | The brother of your spouse; the husband of your sibling; the husband of your spouse's sibling; the spouse of your sibling's spouse |
| Alternative names | BIL, co-brother (Indian English) |
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What You'll Learn

Brother-in-law
A brother-in-law is the brother of your spouse, or the husband of your sibling. The reciprocal relationship is also true: your sibling's spouse is also your brother-in-law. This is a relationship that is not directly related by blood, but by affinity. In Indian English, this can be referred to as a co-sibling.
The term 'in-law' refers to people you are related to by marriage. Some people use acronyms like BIL to refer to their brother-in-law.
The children of your siblings-in-law are your nieces and nephews, and it is common to specify whether they are related 'by marriage' or 'by blood'. If one pair of siblings is married to another pair of siblings, the siblings-in-law are doubly related, both through their spouse and their sibling.
Therefore, your brother-in-law's brother is also your brother-in-law, as he is the brother of your spouse's brother.
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Co-brother
The term "co-brother" is used in Indian English to refer to the husband of one's sibling-in-law. In other words, it is the reciprocal term for a brother-in-law, referring to the husband of one's spouse's sibling. This is distinct from a brother-in-law, who is the brother of one's spouse or the husband of one's sibling.
The term "co-brother" is part of a larger system of kinship terms related to affinity, or relations by marriage, rather than blood. This system includes terms like "sibling-in-law" and "co-sibling," which refer to the reciprocal relationships between a person's spouse and their sibling's spouse. These terms help to clarify the specific nature of the relationship and how individuals are connected within a family.
In some cultures, there are specific terms or conventions for addressing or referring to in-laws. For example, some people may use abbreviations like "BIL" for brother-in-law or "SIL" for sister-in-law. These abbreviations are often used in informal contexts and can vary across different cultural and linguistic backgrounds.
The use of terms like "co-brother" and "co-sibling" in Indian English reflects the unique cultural and linguistic adaptations in defining kinship relationships. These terms provide a clear way to identify and address individuals within the complex web of relationships that arise through marriage and affinity.
Understanding these kinship terms and their variations across cultures is essential for maintaining proper social etiquette and fostering meaningful connections within extended families.
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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. In other words, it is used to describe the relationship between a person and their sibling-in-law's spouse.
To break it down further, if your brother-in-law has a wife, she would be your co-sister, and if your sister-in-law has a husband, he would be your co-brother. This is distinct from the terms "brother-in-law" and "sister-in-law," which refer to the siblings of your spouse or your sibling's spouse.
It's important to note that these terms describe relationships that are not directly related by blood but rather through a type of kinship called affinity, which is common to all in-law relationships. While the specific term "co-sibling" may not be widely used outside of Indian English, the concept of reciprocal relationships between spouses and their sibling's spouses exists in other cultures as well.
In some cultures, it is common to refer to in-laws using abbreviations such as BIL (brother-in-law) and SIL (sister-in-law). However, this usage can vary, and some people may use these abbreviations specifically for their sibling's spouses rather than their spouse's siblings. Ultimately, the terminology used to describe these relationships can vary depending on cultural and personal preferences.
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Friend
The brother of your brother-in-law is your brother-in-law's brother. This is a mouthful and an uncommon relationship, so there is no standard name for this connection. In general, in-laws are people you are related to by marriage, and this person is related to you by your brother-in-law, who is your sibling's spouse. So, this person is your brother-in-law's brother, and you could refer to him as such, or as a friend.
In some cultures, friends of your parents are referred to as aunties and uncles, and their children are like siblings. In this case, you could refer to your brother-in-law's brother as your brother. However, this is not a standard term, and it is more common to refer to this person as your brother-in-law's brother or as a friend.
Some people use abbreviations for in-laws, such as BIL for brother-in-law. Using this abbreviation, you could refer to this person as your BIL's brother. However, this is not a standard term and may not be understood by everyone.
Ultimately, the most common and clear way to refer to this person is as your brother-in-law's brother or as a friend.
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No technical term
There is no widely recognised technical term for your brother-in-law's brother. However, the relationship can be understood as follows:
Your brother-in-law is the brother of your spouse, or the husband of your sibling. Your brother-in-law's brother, therefore, is your spouse's brother-in-law's brother. This makes him your spouse's brother.
In other words, your brother-in-law's brother is simply your spouse's brother. This is because your brother-in-law's brother is related to your spouse, not to you. As such, there is no specific term to describe your relationship with your brother-in-law's brother.
Some people may choose to use shorthand or abbreviations for such relationships, such as "BIL" for brother-in-law. However, this does not change the underlying relationship described above.
In Indian English, there is a term called "co-sibling" to refer to the spouse of one's sibling-in-law. However, this term does not differentiate between the brother or sister of your sibling-in-law. It is also specific to Indian English and may not be widely understood outside of that cultural context.
Ultimately, while there are ways to conceptualise and describe the relationship, there is no specific or technical term for your brother-in-law's brother in the way there is for other relationships by marriage.
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Frequently asked questions
A brother-in-law is the brother of one's spouse, the husband of one's sibling, or the husband of one's spouse's sibling.
A sibling-in-law is the spouse of one's sibling or the sibling of one's spouse.
Your brother-in-law's brother is your co-brother-in-law.

































