
A brother-in-law is a person who becomes your brother due to a marriage relationship. This could be either your sibling's husband or your spouse's brother. In-law relationships are a type of kinship called affinity, which means they are not related by blood. Legally, a brother-in-law is considered a relative, as they are included in the definition of immediate family members. However, their siblings are not legally considered relatives, although they may be considered part of one's family by association and affection.
| Characteristics | Values |
|---|---|
| Definition | A brother-in-law is a person who becomes your brother due to a marriage relationship. |
| Types | A brother-in-law can be the husband of your sibling or the brother of your spouse. |
| Relation | A brother-in-law is not a blood relative but is considered a distant relative. |
| Children | The children of one's siblings-in-law are called nieces and nephews, specified as "by marriage" if necessary. |
| Legal | A brother-in-law is considered an immediate family member for legal purposes. |
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What You'll Learn

Brother-in-law defined
A brother-in-law is a male relative that a person gains through marriage. This can refer to three different relationships:
The brother of one's spouse
This is the most common usage. When a person gets married, their partner's brother becomes their brother-in-law. For example, if Jane marries Michael, Michael's brother is now Jane's brother-in-law.
The husband of one's sibling
If a person's sibling gets married, their spouse becomes the person's brother-in-law. For example, if Michael is Jane's brother, and Michael marries Lily, then Lily is Jane's sister-in-law, and Jane is Lily's sister-in-law. In this case, Lily's brother is Jane's brother-in-law.
The husband of one's spouse's sibling
In this case, the brother-in-law is related to the person through the spouse's sibling. For example, if Jane is married to Michael, and Michael has a sister called Lily who is married to Ethan, then Ethan is Jane's brother-in-law.
It is important to note that a brother-in-law is not a biological brother, but a relation formed through a legal marriage. The term "in-law" is used to indicate a distinction between family ties based on shared ancestry or not.
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Legally related?
Whether a brother-in-law is considered legally related depends on the context and the specific laws and guidelines in place. In most legal contexts, immediate family includes individuals who are closest to an individual, typically those who live in the same household or share a direct relationship. This usually includes parents, siblings, children, and spouses.
However, in certain legal contexts, a broader view of family relationships may be applied, and a brother-in-law may be considered part of the immediate family. This is particularly relevant in scenarios where family relationships are integral to the legal process, such as family leave laws or insurance and benefits. For example, some jurisdictions may extend benefits or leave to individuals related by marriage, such as a brother-in-law.
On the other hand, in more narrowly defined situations, such as medical or estate-related issues, a brother-in-law is typically not included as immediate family. Instead, it is generally limited to parents, siblings, children, and spouses. Similarly, when it comes to healthcare decisions, only immediate family members, like spouses or children, may be permitted to make medical decisions on behalf of an individual, and a brother-in-law usually does not have this right.
It is important to note that the definition of "immediate family" may vary depending on the specific context and jurisdiction, and it is always advisable to refer to the relevant laws and guidelines in a particular situation.
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Religious views
While the concept of a "brother-in-law" is not explicitly mentioned in religious texts, it is important to consider how different religious communities view family relationships and the role of in-laws.
In the Christian tradition, the term "brother" or "sister" is often used to describe spiritual relationships between believers. For example, in the Methodist Church, male monastics or members of a religious order are referred to as "Brothers". Similarly, in the Church of Jesus Christ of Latter-day Saints, adult males and females are often addressed as "brothers" and "sisters". This usage is similar to the terms "Mr." or "Mrs." and is less common among young single adults. All baptized members of Jehovah's Witnesses also refer to each other as "brothers" and "sisters".
In the context of family relationships, Christians often emphasize the importance of honoring and respecting one's parents, which could extend to one's in-laws. However, there is also an understanding that individuals have the right to make decisions regarding their own spiritual beliefs and the upbringing of their children. This can lead to conflicts when in-laws have differing religious views, as seen in discussions on the Berkeley Parents Network, where individuals seek advice on navigating religious differences with in-laws.
In Islam, the term "brother-in-law" (Mahram) takes on a broader meaning and includes the husband's male cousins, aunts, and uncles. This is because Islam prohibits marriage within the immediate family, and the term "brother-in-law" is used to indicate a level of closeness or kinship. While the specific term "brother-in-law" may not be commonly used in Islamic religious texts, the concept of extended family and the importance of family ties are prevalent in Islamic teachings.
In Judaism, the term "brother-in-law" (Choten) is used similarly to its definition in Western culture, referring to the brother of one's spouse or the husband of one's sibling. While Judaism places a strong emphasis on family and community, there is also a recognition of the individual's right to choose their own path in terms of religious observance and interpretation of Torah. This could lead to differing views within families and extended families, including in-laws.
In summary, while the term "brother-in-law" may not carry specific religious connotations, the concept of family and extended family relationships is important in many religious traditions. The role of in-laws can vary depending on cultural and personal interpretations of religious teachings, and individuals often seek guidance on navigating religious differences within their families.
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Family ties
The term "brother-in-law" refers to a family relationship based on marriage rather than shared ancestry. A brother-in-law is a brother you gain due to a marriage relationship between either you and your spouse or your sibling and their spouse. In other words, a brother-in-law is the husband of your sibling or the brother of your 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".
In-laws are people you are related to by marriage. When you get married, your partner's relatives become your relatives, and you refer to their family as your "in-laws". For example, your partner's mother becomes your "mother-in-law", and their father becomes your "father-in-law".
While a brother-in-law is considered a relative, they are not a blood relative. In some contexts, such as providing references for applications, they may not be considered a relative at all. For example, when applying for a provisional driving licence, a reference must be filled out by someone who is not a relative, and in this case, a brother-in-law's sister would likely meet this criterion.
In some cultures and legal systems, the term sibling-in-law is used to refer 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". For example, the wife of one's sibling-in-law is called a "co-sister", and the husband of one's sibling-in-law is called a "co-brother".
In summary, while a brother-in-law is considered a relative in the context of family relationships, they are not biologically related by blood. In certain legal and cultural contexts, they may not be considered a relative at all.
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Marriage and kinship
Kinship refers to the web of social relationships that are formed as a result of marriage. It is an important part of the lives of all humans in all societies, although the exact meanings of kinship within anthropology are often debated. In general, kinship is about relationships, which are defined by status and roles. Status is any culturally-designated position a person occupies in a particular setting, and the role is the set of behaviours expected of an individual who occupies a particular status. For example, a person may have the status of "mother", and the role associated with this status would include caring for children.
Kinship can be formed through blood connections (consanguineal), such as those between parents and children, or through marriage ties (affinal), such as in-laws. In-laws are a person's partner's family members, who become that person's family through marriage. For example, a brother-in-law is the brother of one's spouse, or the husband of one's sibling.
Kinship diagrams, or charts, are often used to map out kinship relations. They use a specific person, called Ego, as a starting point, and this person's relatives are mapped out using specific shapes and lines to indicate gender, marriage, and other relationships. These diagrams can be useful in understanding the worldview of a particular group, as well as how they organize themselves into cohesive groups.
In summary, marriage and kinship are interconnected concepts that vary across cultures. Marriage brings two individuals together, and kinship extends this union to create a web of social relationships that form the basis of human societies.
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Frequently asked questions
Yes, a brother-in-law is considered a relative, but not a blood relative.
A brother-in-law is the brother of your spouse, or the husband of your sibling.
Yes, the term can be used to refer to the brother of your husband or wife, or the husband of your sister.
No, your brother-in-law's sister is not a blood relative, but she could be considered a distant relative.
Yes, many languages have different words for the relationship. In Indian English, for example, the husband of your sibling may be referred to as a 'co-brother'.











































