
A sibling-in-law is the spouse of one's sibling or the sibling of one's spouse. There is no commonly used name for the relationship between a person and their sibling-in-law's sibling. In this case, the siblings of your brother-in-law are not considered your siblings-in-law. However, if you feel close to them, you could refer to them as your siblings-in-law in casual conversation or simply as friends.
| Characteristics | Values |
|---|---|
| Commonly used term | Brother-in-law |
| Alternate terms | Co-brother-in-law, co-sibling, friend |
| Relation | The brother of the spouse of one's sibling |
| Relation (simplified) | Your sibling's husband or wife's brother |
| Children of siblings-in-law | Nieces and nephews (by marriage) |
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What You'll Learn
- There is no commonly used name for this relationship
- The brother of your brother-in-law is your co-brother-in-law
- Your brother-in-law's siblings are related to you by affinity, not blood
- In Indian English, your brother-in-law's siblings are co-siblings
- Your brother-in-law's siblings are your nieces/nephews by marriage

There is no commonly used name for this relationship
A sibling-in-law is the spouse of one's sibling or the sibling of one’s spouse. In common usage, a male sibling-in-law is referred to as a "brother-in-law" and a female sibling-in-law is referred to as a "sister-in-law". However, there is no widely recognised term for the relationship between a person and the sibling of their sibling-in-law.
In this scenario, the relationship in question is between two people who are not directly related by blood. The connection is formed through the marriage of one person's sibling to another person. This creates a network of kinship based on affinity, which is a type of relationship that arises through marriage.
While there is no single term to describe this connection, there are a few ways it can be contextualised. One approach is to simply refer to the person as "my brother-in-law's brother" or "my sister-in-law's sister". This clarifies the connection without requiring a specific label. Alternatively, if there is a close relationship, one might refer to the person as "my brother-in-law" or "my sister-in-law" in casual conversation, or simply as "a friend".
In Indian English, the term "co-sibling" is sometimes used to describe this type of relationship. Specifically, "co-sister" refers to the wife of one's sibling-in-law, and "co-brother" refers to the husband of one's sibling-in-law. However, these terms are not universally understood or commonly used outside of Indian English.
Ultimately, the choice of terminology depends on the context and the purpose of the description. If a precise technical term is required, it may be necessary to use a more lengthy or descriptive phrase. However, in most cases, language is flexible, and one can choose words that suit the purpose and context of the conversation.
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The brother of your brother-in-law is your co-brother-in-law
The concept of "in-laws" refers to people who are related to you by marriage. The brother of your spouse is your brother-in-law, and your siblings' spouses are also your brothers-in-law. In this context, the brother of your brother-in-law is your co-brother-in-law, a term specifically used in Indian English. This term describes the relationship between two people who are not directly related by blood but are connected through marriage.
While the term "co-brother-in-law" is not commonly used in everyday conversation, it accurately describes the relationship between the brother of your brother-in-law and yourself. This type of kinship is called affinity, and it is similar to other in-law relationships. In other words, your co-brother-in-law is related to you through marriage, but there is no direct blood relation.
It is worth noting that the children of your co-brother-in-law would be referred to as your nieces and nephews, with the specification of "by marriage" to distinguish them from nieces and nephews by blood or adoption. This further emphasizes the affinity or connection through marriage that defines the relationship between you and your co-brother-in-law.
While there is no universally accepted term for this specific relationship, some people may choose to simply refer to their co-brother-in-law as their brother-in-law, especially if they have a close relationship. Alternatively, they may refer to him as a friend or use his name without a specific familial label. Ultimately, the choice of terminology depends on personal preference and the level of precision needed in describing the relationship.
In conclusion, while there may not be a widely recognized term for the brother of your brother-in-law in all cultures and languages, the concept of a "co-brother-in-law" effectively captures the nature of this relationship. It is a relationship based on affinity or connection through marriage, and it is important to specify this distinction when referring to nieces, nephews, or other extended family members.
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Your brother-in-law's siblings are related to you by affinity, not blood
When it comes to determining family relationships, it's important to understand the difference between relationships by blood and those by affinity. Blood relationships refer to biological connections, while relationships by affinity are formed through marriage or adoption. In the context of your question, your brother-in-law's siblings are related to you by affinity, not blood. This means that there is no direct biological connection between you and your brother-in-law's siblings.
So, who exactly are your brother-in-law's siblings to you? They are your relatives through the marriage bond you share with your spouse. Your spouse's siblings are your siblings-in-law, and their spouses are your brothers- or sisters-in-law as well. This extends to their siblings too. So, your brother-in-law's siblings are your siblings-in-law as well. This relationship is formed through the legal and emotional bond of marriage, creating a new network of relatives beyond your biological family.
The degree of closeness and connection you feel with your brother-in-law's siblings can vary. It depends on factors such as the nature of your relationship with your spouse's family, geographical proximity, and personal dynamics. Some people develop close and supportive relationships with their in-laws, while others may have more distant or strained connections. It's worth noting that just because there is no biological tie, it doesn't diminish the significance or potential depth of the relationship.
Cultivating positive relationships with your extended family, including your siblings-in-law, can bring numerous benefits. It can provide a sense of belonging and support, especially if you don't have close ties with your biological family. Additionally, it can strengthen the bond with your spouse's family and create a more harmonious and inclusive environment for everyone. However, it's also important to respect personal boundaries and understand that not everyone desires or needs close relationships with extended in-laws.
In summary, your brother-in-law's siblings are your relatives by affinity, formed through the marriage connection with your spouse. While there is no biological tie, these relationships can still be meaningful and important. The nature and depth of the relationship can vary depending on personal dynamics and preferences. Understanding and respecting these variations are key to fostering healthy and positive connections with your extended in-laws.
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In Indian English, your brother-in-law's siblings are co-siblings
The concept of co-siblings is based on the idea of kinship through affinity, which is a type of relationship that is not directly related by blood. This is similar to other in-law relationships, where the connection is formed through marriage rather than biological ties. In the context of co-siblings, it specifically refers to the reciprocal relationship between a person's spouse and their sibling's spouse.
It is worth noting that the terminology surrounding in-laws and extended family relationships can be complex and vary across different cultures and languages. While Indian English has adopted specific terms like co-sister and co-brother, other languages like Russian have their own unique words to describe these relationships. In general, the usage of these terms depends on the importance of exactness in relationships within a particular culture.
In the case of your brother-in-law's siblings, there is no universally accepted term in English. Commonly, you would refer to them as "my brother-in-law's brother" or "my brother-in-law's sister". If you share a close relationship with them, you might simply call them "my brother-in-law" or "my sister-in-law" in casual conversation, or even just "a friend". Ultimately, the choice of terminology depends on the context and the purpose you wish to achieve in describing the relationship.
While there is no standard technical term for this relationship, the Indian English usage of "co-sibling" provides a unique and specific way to refer to these extended family connections. It is an interesting example of how languages evolve to suit the cultural and social needs of the speakers, and how family structures are defined and understood differently across various regions.
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Your brother-in-law's siblings are your nieces/nephews by marriage
Your brother-in-law's siblings are your nieces or nephews by marriage. While there is no commonly used name for this connection, the children of one's siblings-in-law are simply called nieces and nephews, with the specification of "by marriage" to distinguish them from nieces and nephews by blood or adoption.
To break it down, let's consider an example. Suppose you have a brother-in-law, Martin. Martin has a sibling, William. In this case, William is your brother-in-law's brother, but there is no specific term for his relationship to you. If you want to be precise, you could refer to William as "my brother-in-law's brother" or simply as a friend.
Now, let's introduce another layer of relationships. Suppose Martin is married to your sister, and William is also married, and his wife is called Sarah. In this case, Sarah is your brother-in-law's sister-in-law, and she is also your niece by marriage.
The same logic applies if we consider your brother-in-law's siblings' children. Using the previous example, if William has children, they would be your nieces or nephews by marriage. This distinction of "by marriage" is used to differentiate these relationships from those by blood or adoption.
These kinship terms are based on affinity, which is a type of relationship where individuals are related by marriage rather than by direct blood connections.
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Frequently asked questions
There is no commonly used name for this connection. You would normally say "my brother-in-law's brother" or "my brother-in-law's sister".
A brother-in-law is the brother of one's spouse, or the husband of one's sibling.
In Indian English, a co-sibling is the wife or husband of one's sibling-in-law.
Yes, in English, the term "in-law" refers to a family relationship based on marriage rather than shared ancestry. However, in other languages, there may be different words for each type of relationship.





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