
The husband of your husband's sister is commonly referred to as your brother-in-law. However, legally, the husband of your sister-in-law is not a blood relation and has no relation to you at all. While some people use the term brother-in-law in this context, it is not technically or legally accurate.
| Characteristics | Values |
|---|---|
| Relationship | Brother-in-law |
| Description | Husband of one's sister or husband of the sister of one's spouse |
| Alternate names | Co-brother (Indian English) |
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What You'll Learn
- The husband of your sister-in-law is technically no relation of yours
- Some people refer to their husband's sister's husband as their brother-in-law
- Legally, the husband of your sister-in-law is not your brother-in-law
- The husband of your sister-in-law has no ancestors that are also your ancestors
- The husband of your sister-in-law is your concuñado in Spanish

The husband of your sister-in-law is technically no relation of yours
The husband of your sister-in-law is technically not a blood relation of yours. However, the term "brother-in-law" is used in modern English to refer to the husband of one's sister, the brother of one's spouse, and the husband of the sister of one's spouse. In this case, the husband of your sister-in-law can be referred to as your brother-in-law, although you are not directly related by blood.
In Indian English, the husband of your sister-in-law would be referred to as a "co-brother," which is a gender-neutral term that specifically refers to the spouse of the sister of one's spouse. This term is used to differentiate from "brother-in-law," which is used for the brother of one's spouse.
Some people may prefer to use more general terms like "in-laws" or simply refer to the person by their first name to avoid any confusion or complexity in terminology. It is worth noting that the usage of kinship terms has evolved, and some older terms may no longer be commonly used or understood in modern English.
While there is no direct blood relation between you and the husband of your sister-in-law, the relationship is one of affinity, a type of kinship that characterizes all in-law relationships. This means that there is an indirect connection or association through marriage, creating a social or legal bond rather than a biological one.
In certain cultural and legal contexts, such as Islamic law (Sharia) and Jewish law (halakha), relationships between siblings-in-law are treated with specific significance. For example, sexual relations between siblings-in-law are prohibited as incestuous unless the spouse is no longer married.
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Some people refer to their husband's sister's husband as their brother-in-law
The husband of your husband's sister is commonly referred to as a brother-in-law. However, legally, he is not a relation of yours. In this context, the term "brother-in-law" is used as a general term of affection rather than a technical or legal definition. Some people may prefer to refer to this person as "my husband's sister's husband" to avoid any confusion.
In English, the term "brother-in-law" can have multiple meanings, including one's wife's or husband's brother, one's sister's husband, or one's sister-in-law's husband. While there is no specific word in English for the husband of one's sister-in-law, the term "brother-in-law" is commonly used as a catch-all term for these various relationships.
Some people may choose to use the term "brother-in-law" to refer to their husband's sister's husband out of convenience or to simplify family relationships. It can be cumbersome to constantly refer to this person as "my husband's sister's husband," especially in casual conversation. Using the term "brother-in-law" can help create a sense of familiarity and closeness within the family unit.
Additionally, the term "brother-in-law" may be used to acknowledge the social and emotional bonds that are formed through marriage. While there may not be a legal or genetic relationship between two people who marry into a family, they still become part of each other's lives and play important roles within the family dynamic. Using the term "brother-in-law" can be a way to recognize and honor these connections.
However, it is important to note that not everyone may be comfortable using the term "brother-in-law" in this context. Some people may prefer to reserve this term for blood relatives or legal relations only. Ultimately, the choice of terminology depends on personal preference, family dynamics, and cultural norms.
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Legally, the husband of your sister-in-law is not your brother-in-law
While it is common in US English to refer to the husband of your sister-in-law as your brother-in-law, this is not strictly accurate in a legal sense. A brother-in-law is defined as one's wife's or husband's brother, one's sister's husband, or one's sister-in-law's husband. In this definition, the husband of your sister-in-law falls under the third category, as he is the husband of your spouse's sister, and therefore your brother-in-law.
However, this usage is not universally accepted. Some people argue that the term 'brother-in-law' should only be used for brothers of one's spouse, and that the husband of a sister-in-law is not one's brother-in-law. This is because the relationship is not direct, but rather through marriage. The husband of your sister-in-law is your spouse's brother-in-law, and therefore your relationship to him is through your spouse, not directly.
In Indian English, the husband of one's sister-in-law is referred to as a co-brother, which is a gender-neutral term. This term is used to denote the husband of a sister-in-law specifically, as 'brother-in-law' can also mean the brother of a spouse. This distinction is not made in US English, where 'brother-in-law' is commonly used to refer to both relationships.
While there is no definitive legal answer to this question, it is important to note that the usage of 'brother-in-law' to refer to the husband of a sister-in-law is not universally accepted. It is a matter of personal preference and context, and some people may choose to use different terms or simply refer to the person by their name.
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The husband of your sister-in-law has no ancestors that are also your ancestors
The husband of your sister-in-law is not your brother-in-law. While some people may refer to him as such, he is simply your sister-in-law's husband. He has no relation to you and is not a part of your family tree as he has no ancestors that are also your ancestors. The only way this would be the case is if your spouse has children from a previous marriage, in which case, those children are your stepchildren, and their other biological parent is your stepchild's parent.
The term "brother-in-law" is typically used to refer to the brother of one's spouse, or the husband of one's sibling. In the latter case, the relationship is one of affinity or alliance, rather than blood relation. This is because, in the case of siblings, you share a common ancestor (usually one or both parents) with your brother or sister, whereas your spouse's sibling does not share this common ancestor with you.
The husband of your sister-in-law falls into this latter category of being related by alliance rather than blood. He is the brother-in-law of your spouse, and the relationship between the two of them is what makes him your sister-in-law's husband. While it may be convenient to refer to him as your brother-in-law, this is not technically correct in terms of familial relationships.
It is worth noting that some cultures have different ways of addressing this relationship. For example, in India, the husband of one's spouse's sister may be referred to as a "co-brother". Additionally, in some cases, the husband of your sister-in-law may become your children's uncle, blurring the lines of the relationship.
In conclusion, while there may be some informal usage of the term "brother-in-law" to refer to the husband of your sister-in-law, it is more accurate to simply refer to him as your sister-in-law's husband, as they have no common ancestors.
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The husband of your sister-in-law is your concuñado in Spanish
In Spanish, the term "concuñado/concuñada" refers specifically to the spouse of your brother-in-law or sister-in-law. On the other hand, "cuñado/cuñada" refers to your brother-in-law or sister-in-law themselves. These terms help to clarify the relationship and distinguish between your siblings-in-law and their spouses.
Similarly, in French, there is no specific word for this relationship, and the husband of your sister-in-law would typically be called your "brother-in-law" as well. Other languages, such as German, have terms like "Schwippschwager" and "Schwippschwägerin" to describe the spouse of your sibling's husband or wife.
While there may be variations in terminology and cultural norms across different languages and regions, it is clear that the relationship between individuals connected by marriage can be complex and nuanced. The husband of your sister-in-law may be referred to as your "brother-in-law" in everyday conversation, but it is important to understand the technical and legal definitions of these relationships as well.
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Frequently asked questions
Yes, your husband's sister's husband is your brother-in-law.
Your husband's sister's husband can also be referred to as "the husband of your sister-in-law".
No, your husband's sister's husband is not related to you.
No, in some cultures, like Spanish, there are specific words to describe the relationship between people. In English, there are fewer kinship terms.







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