
A brother-in-law is a relative, albeit not a blood relative. In the UK, a brother-in-law is a male figure who is married to your sister, or your brother if he is in a civil partnership. The use of in-law demonstrates that the two are not related by blood, but by the marriage to a spouse. A brother-in-law is considered an immediate family member, and so is a relative.
| Characteristics | Values |
|---|---|
| Relationship | Brother-in-law |
| Description | Brother-in-law is a male figure who is married to your sister, or your brother if he is in a civil partnership. |
| Type of kinship | Affinity |
| Related by blood | No |
| Related by marriage | Yes |
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What You'll Learn

A brother-in-law is a relative by marriage, not blood
A brother-in-law is a relative by marriage, not by blood. The term "in-law" refers to a family relationship based on marriage rather than shared ancestry. In other words, a brother-in-law is a male figure who is married to your sister, or your brother if he is in a civil partnership. This means that your brother-in-law is not a biological brother, but someone who becomes a brother through a legal marriage.
The term "brother-in-law" can also be used to refer to the brother of your husband or wife. In this case, the brother-in-law is related to you by marriage, as your spouse's sibling, but not by blood. This usage of the term is less common and can lead to misunderstandings.
In some cultures, such as Indian English, the wife of one's brother-in-law is referred to as a "co-sister" and the husband of one's sister-in-law as a "co-brother". These terms emphasise the reciprocal relationship between a person's spouse and their sibling's spouse.
It is important to note that the definition of a relative may vary depending on the cultural and legal context. For example, in Islamic law (Sharia) and Jewish law (halakha), sexual relations between siblings-in-law are prohibited as incestuous. However, in Judaism, there was a custom of yibbum, where a man had a non-obligatory duty to marry his deceased brother's childless widow.
In the UK, the term "immediate family member" typically includes children, stepchildren, grandchildren, parents, stepparents, grandparents, spouses, siblings, mothers-in-law, fathers-in-law, sons-in-law, daughters-in-law, brothers-in-law, and sisters-in-law, including adoptive relationships. This definition highlights the legal recognition of in-laws as relatives in the UK context.
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A brother-in-law is a male figure married to your sister
In the UK, a brother-in-law is a male figure married to your sister, or your brother if he is in a civil partnership. The use of the term "in-law" demonstrates that the two are not related by blood but by marriage to a spouse. A brother-in-law is a relative, though not a blood relative.
When a person gets married, their spouse's siblings become their brothers- or sisters-in-law. This means that your brother-in-law's sister is also your sister-in-law. However, your brother-in-law's brothers are not related to you, although they are part of your family by association and affection.
The term "in-law" refers to a family relationship based on marriage rather than shared ancestry. This is a reciprocal relationship, so if you are someone's brother-in-law, they are also your brother-in-law. This can lead to confusion, as the term "brother-in-law" can have three different meanings depending on the context: the husband of your wife's sister, your sister's husband, or your wife's brother.
In Indian English, the wife of one's brother-in-law is referred to as a "co-sister", and the husband of one's sister-in-law is referred to as a "co-brother". 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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A brother-in-law is a brother of your spouse
A brother-in-law is a male figure who is married to your sister, or the brother of your spouse. The use of "in-law" demonstrates that the two are not related by blood but by marriage. In other words, a brother-in-law is a brother you gain because of a marriage relationship between either you and your spouse or your sibling and their spouse.
In the UK, a brother-in-law is considered a relative. They are one of your in-laws, and when someone gets married, the spouse's family is viewed as being part of your family in the eyes of the law.
The term "in-law" refers to a family relationship based on marriage rather than shared ancestry. A brother-in-law is not a biological brother but someone who becomes a brother by means of a legal marriage.
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".
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A brother-in-law's sister is not a relative
A brother-in-law is a male figure who is married to one's sister or is the brother of one's spouse. The use of the term "in-law" demonstrates that the two are not related by blood but by marriage to a spouse. A brother-in-law is not a biological brother but someone who becomes a brother by means of a legal marriage.
Some people may consider a brother-in-law's sister to be a relative by association and affection, even if there is no legal or biological relationship. This is especially true if the families have been close since birth, as in the case of uncles and aunts. However, when a reference asks for no relatives, it generally means someone who is not legally or biologically related, such as a tutor, former employer, or youth worker.
Furthermore, the term "relative" can have different meanings depending on the context and culture. For example, in Indian English, the wife of one's brother-in-law is called a "co-sister," and they are considered relatives, even though they are not biologically related.
In summary, while a brother-in-law is considered a relative in the UK, his sister is not legally or biologically considered a relative, but she may still be considered part of the family by association and affection.
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A brother-in-law is a type of kinship called affinity
A brother-in-law is a male figure who is married to your sister or is the brother of your spouse. This relationship is not biological but is formed through marriage. Therefore, a brother-in-law is a type of kinship called affinity. Affinity is a term used in law and cultural anthropology to describe a kinship relationship that arises between two people as a result of someone's marriage. It refers to the relationship each party in the marriage has with the family of the other party in the marriage.
Kinship can refer to the patterns of social relationships themselves or the study of these patterns in one or more human cultures. While some societies classify kinship relations based on shared ancestry, others classify them based on marriage, or affinity.
In some cultures, kinship relationships may extend to people with whom an individual has economic or political relationships. The term "affinity" is also used in a more general sense to refer to a similarity or affinity between entities based on shared characteristics, such as a shared historical or cultural connection.
The concept of affinity is closely related to the idea of "in-laws" or "family-in-law". These terms are commonly used to refer to relatives by marriage, with affinity being signified by adding the suffix "-in-law" to a degree of kinship. For example, a "parent-in-law" or "sibling-in-law".
It is important to note that the laws, traditions, and customs relating to affinity vary across different jurisdictions and have changed over time. In some cases, affinity may be relevant in relation to prohibitions on incestuous relationships or restrictions on marriage between certain couples.
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Frequently asked questions
Yes, a brother-in-law is considered a relative in the UK.
A brother-in-law is a male figure who is married to your sister or the brother of your spouse.
Yes, a brother-in-law can be your wife's brother or your sister's husband.
Yes, a brother-in-law can also be referred to as a "sibling-in-law".




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