
Your brother-in-law's child is your niece or nephew by marriage. If you are close to the child, you may be referred to as their honorary uncle or aunt. However, it is important to note that you do not hold any official family title or share a direct biological connection with this child.
| Characteristics | Values |
|---|---|
| Relationship to you | Brother-in-law's niece or nephew |
| Your relationship to them | Niece or nephew (by marriage) |
| Relation to your children | First cousin (by marriage) |
| Relation to your parents | Niece or nephew (by marriage) |
| Relation to your siblings | Niece or nephew (by marriage) or cousin (by marriage) |
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What You'll Learn

The child is your niece or nephew by marriage
The child of your brother-in-law is your niece or nephew by marriage. This type of kinship is called affinity, and it is a relation that does not connect you directly by blood. In this case, your brother-in-law is the sibling of your spouse, or the spouse of your sibling. Therefore, their child is your niece or nephew by marriage.
From a genealogical perspective, the child of your brother-in-law is your sister's husband's niece or nephew, and you are this child's uncle's wife's brother or sister's husband. More casually, you could refer to the child as your sister's niece or nephew, and you would be their aunt or uncle by marriage. If you are close to the child and their family, you may be referred to as “uncle” or "aunt", or simply as a family friend.
In English, there is no specific term to describe this type of relationship, so it is often simplified to "cousins" or "distant cousins", or simply “not related”. However, it is important to note that family by marriage is still a meaningful connection, and chosen family can be just as strong as blood relatives.
In Indian English, the term "co-sibling" may be used to refer to the spouse of one's sibling-in-law. In this case, the child of your brother-in-law could be referred to as the child of your co-sibling, further emphasising the affinity or kinship by marriage.
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The child is your brother-in-law's niece or nephew
The child of your brother-in-law is your niece or nephew. They are your niece or nephew by marriage, as opposed to by blood or by adoption. If your sister and her husband have a child, then that child and your brother-in-law's child are cousins.
In English, there is no specific term to describe the relationship between yourself and your brother-in-law's niece or nephew. Some people refer to the child as their niece or nephew by marriage. You could also be referred to as an honorary "uncle" or "aunt" if you are close to the child and their family.
The child of your brother-in-law is not related to you by blood. However, in-law family is still a connection, and some people consider chosen family to be a stronger bond than blood.
In Indian English, the wife of your brother-in-law is referred to as a co-sister, and you could refer to her niece or nephew as your co-sister's niece or nephew.
Ultimately, the terminology used to describe the relationship may depend on how close your family is to your brother-in-law and their niece or nephew.
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If your sibling and their spouse have a child, they are cousins
If your sibling and their spouse have a child, that child is your niece or nephew. Your brother-in-law's child is your niece or nephew by marriage. If your sibling and their spouse's sibling also have a child, that child would be your niece or nephew's cousin. In this case, your brother- or sister-in-law's child is your cousin.
In-law relationships are a type of kinship called affinity, and these relations are not connected by blood. The children of your siblings-in-law are your nieces and nephews, and this can be specified as "by marriage", "by blood", or "by adoption" if necessary. If one pair of siblings is married to another pair of siblings, the children of the two couples are double cousins.
While the child of your sibling and their spouse is your niece or nephew, and their cousin, you do not have a direct familial title or connection to that child. However, if you are close to the child and their parents, you may be an honorary "aunt" or "uncle". Some families are close to their in-laws, while others are not. Family by marriage is still a connection, and chosen family can be a stronger bond than blood.
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You are the child's aunt or uncle by marriage
If your brother-in-law has a child, that child is your niece or nephew by marriage. If your sister and her husband have a child together, then that child is your niece or nephew, and their cousin.
In this scenario, you are the child's aunt or uncle by marriage. There is no specific term to describe this relationship in English, and you are not directly related by blood. However, this does not mean that you cannot be considered family. The child may refer to you as "Aunt" or "Uncle" if you are close, and you are still connected by marriage. The nature of your relationship with the child and their family will determine how you refer to one another.
In some cultures, there are different terms to describe this relationship. For example, in Indian English, the husband of one's sibling-in-law is a co-brother, and the wife of one's sibling-in-law is a co-sister. In this case, the child of your co-brother or co-sister would be your niece or nephew, and you would be their aunt or uncle.
It is worth noting that, in some legal systems, such as Islamic Law (Sharia) and Jewish Law (halakha), sexual relations between siblings-in-law are prohibited as incestuous. However, in Judaism, there was a custom called yibbum, where a man had a non-obligatory duty to marry his deceased brother's childless widow.
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You are the child's sister's husband's nephew/niece
Your relationship to the child of your brother-in-law would be that of a niece or nephew. This is because your brother-in-law is the sibling of your spouse, and so his child is your spouse's niece or nephew. This makes the child your niece or nephew by marriage. Specifically, you are the child's sister's husband's niece or nephew.
Now, let's break this down further:
If your brother-in-law has a child, that child is the cousin of your spouse. Your spouse and the child share an uncle-aunt relationship with the brother-in-law. Therefore, the child is your spouse's cousin-niece or cousin-nephew.
From your perspective, your spouse's cousin-niece or cousin-nephew is connected to you through your spouse. You are their aunt or uncle through marriage. So, you would refer to the child as your niece or nephew as well, specifying that it is through marriage or your sister-in-law if needed for clarity.
For example, when introducing the child to someone, you could say, "This is my niece/nephew, the child of my brother-in-law," or "This is my niece/nephew through marriage." If you want to be more specific, you could say, "This is my sister-in-law's child, so she/he is my niece/nephew."
It is important to remember that family relationships through marriage can vary in terminology and practice across different cultures and regions. The terms "niece" and "nephew" may also be used loosely in some families to refer to any young relatives, even if the technical relationship is more distant. Ultimately, how you choose to refer to this relationship may depend on your personal family dynamics and preferences.
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Frequently asked questions
Your brother-in-law's child is your niece or nephew by marriage.
Your brother-in-law's sister is your sister-in-law, so her child is your niece or nephew. If you need to specify, you can say they are your niece or nephew "by marriage".
You can call your brother-in-law's child your niece or nephew, or your niece/nephew by marriage if you need to specify.
Your brother-in-law's child calls you their aunt or uncle, or their aunt/uncle by marriage. If you are close to the child, they may call you "auntie" or "uncle".







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