
A brother-in-law is a term used to refer to the brother of one's spouse, the husband of one's sibling, or the husband of one's spouse's sibling. In other words, it is a term used to describe the reciprocal relationship between a person's spouse and their sibling's spouse. This type of kinship is called affinity and is a relation that is not directly connected by blood. While the term is commonly used to refer to male siblings-in-law, the female equivalent is sister-in-law.
| Characteristics | Values |
|---|---|
| Relationship to spouse | Brother of one's spouse |
| Husband of one's sibling | |
| Husband of one's spouse's sibling | |
| Husband of one's sister | |
| Brother of one's husband or wife | |
| Husband of one's brother's wife | |
| Husband of one's sister's husband | |
| Husband of one's sister-in-law's husband |
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What You'll Learn

Brother of one's spouse
The brother of one's spouse is commonly referred to as one's brother-in-law. This term is used to refer to the male sibling of one's spouse, and 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, specifically a co-brother for the husband of one's sibling-in-law.
The brother of one's spouse is related by affinity, a type of kinship that applies to all in-law relationships. This means that the brother of one's spouse is not related by blood but by marriage. When a person gets married, their spouse's siblings become their siblings-in-law. This is a general term for a spouse's siblings, and it is not necessary for the siblings to be related by blood to be considered siblings-in-law. If one pair of siblings marries another pair of siblings, the siblings-in-law are doubly related, both through their spouse and their sibling.
The children of one's siblings-in-law are referred to as nieces and nephews, and if necessary, it can be specified whether they are related "by marriage", "by blood", or "by adoption". While the term "brother-in-law" commonly refers to the brother of one's spouse, it can also be used to refer to the husband of one's sibling.
While the brother of one's spouse is commonly referred to as one's brother-in-law, it is worth noting that there may be cultural or regional variations in how this term is used. Additionally, in some cases, people may choose to refer to their brother-in-law's wife as their sister-in-law, even though technically, she is not a blood relative.
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Husband of one's sibling
The term "brother-in-law" is used to refer to the husband of one's sibling. This relationship is formed through affinity, a type of kinship, and is not a blood relation. When a person gets married, their spouse's siblings become their brothers- or sisters-in-law.
In this context, a brother-in-law is commonly understood as the husband of one's sibling. This definition extends to the reciprocal relationship, where the husband of one's sibling's spouse is also considered a brother-in-law. For example, if one has a sister who is married, her husband is considered one's brother-in-law.
The term "in-law" signifies that the relationship is formed through marriage rather than blood. This is an important distinction, as it defines the nature of the kinship and the legal recognition of the relationship. In some cultures, like Indian English, the husband of one's sibling may be referred to as a "co-brother," further clarifying the nature of the relationship.
It is worth noting that the term "brother-in-law" can also be used in a broader sense to refer to the brother of one's spouse. This usage is reflected in various definitions and examples, where the brother of one's husband or wife is also considered a brother-in-law.
While the primary focus of the question is on the husband of one's sibling, it is important to acknowledge that the term "brother-in-law" can have a broader application depending on cultural and familial contexts.
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Husband of one's spouse's sibling
The brother-in-law is a term used to refer to the husband of one's spouse's sibling. This relationship is formed through affinity, a type of kinship, and is not a blood relation. In other words, when a person gets married, their spouse's brother becomes their brother-in-law.
The term 'brother-in-law' can also be used to refer to the brother of one's spouse. In this case, the brother of one's spouse is directly related by blood. However, the more common usage of the term is to refer to the husband of one's spouse's sibling.
In some cultures, there are different terms used to refer to the husband of one's spouse's sibling. For example, in Indian English, this relationship can be referred to as a 'co-sibling'. Specifically, the term 'co-brother' can be used to refer to the husband of one's sibling's spouse.
It is important to note that the term 'brother-in-law' is a compound noun and is hyphenated. The plural form of the word is 'brothers-in-law'. While the term is commonly used to refer to a male figure, it can also be used to refer to the wife of one's spouse's sibling, who would be addressed as a 'sister-in-law'.
The term 'in-law' is used to indicate that these relationships are formed through marriage rather than blood. Once a person is legally married, their spouse's family is viewed as part of their own family in the eyes of the law.
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Brother of one's wife
The brother of one's wife is commonly referred to as one's brother-in-law. The term "in-law" is descriptive of a relationship with the family of one's life partner, whether legally married or not. In this case, the "brother-in-law" relationship is one that is formed by affinity, or a type of kinship, rather than by blood.
The term "brother-in-law" can also refer to the brother of one's husband, the husband of one's sibling, or the husband of one's spouse's sibling. In Indian English, the term co-brother is used to refer to the brother-in-law of one's spouse.
The children of one's siblings-in-law are called nieces and nephews, and if necessary, it is specified whether they are "by marriage", "by blood", or "by adoption". If one pair of siblings is married to another pair of siblings, the siblings-in-law are related to each other through their spouse and through their sibling.
In some cultures, the term "in-law" has legal implications. For example, 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.
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Husband of one's sister
The term "brother-in-law" is used to refer to the brother of one's spouse or the husband of one's sibling. In this case, we are focusing on the latter definition, specifically the husband of one's sister. This relationship is formed through marriage, and the husband of one's sister becomes a relative by affinity or "in-law". This term is used to distinguish that the relationship is not one of blood relation but rather one formed through marriage.
The husband of one's sister is commonly referred to as a brother-in-law, and this relationship is reciprocal, meaning that the husband's sister also becomes the brother's sister-in-law. This reciprocal relationship is also seen in Indian English, where the husband of one's sibling-in-law is referred to as a "co-brother".
It is important to note that this relationship is not directly related by blood, and the children of one's brother-in-law are referred to as nieces and nephews, with the specification of "by marriage" if needed. This type of relationship is also seen in other cultures, such as in Islamic law (Sharia) and Jewish law (halakha), where sexual relations between siblings-in-law are prohibited as incestuous unless the spouse is no longer married.
In summary, the husband of one's sister is commonly referred to as a brother-in-law, and this relationship is formed through marriage, creating a kinship by affinity or "in-law". This term distinguishes that the relationship is not one of blood relation but rather one that is legally recognised as part of one's family through marriage.
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Frequently asked questions
Your brother-in-law is the brother of your spouse or the husband of your sibling.
Technically, your brother's wife's brother is not related to you. However, most people would consider him a brother-in-law.
The brother of your spouse's sibling is your brother-in-law.
The plural of brother-in-law is brothers-in-law.











































