
The English language has relatively few kinship terms compared to many other languages. The children of one's siblings-in-law are called nieces and nephews, with the specification of by marriage to distinguish them from blood relatives or adopted family members. Therefore, your relationship to your brother-in-law's child is that of a niece or nephew.
| Characteristics | Values |
|---|---|
| Relationship to brother-in-law's child | Niece or nephew "by marriage" |
| Alternative terms | Distant cousins or cousins-in-law |
| Relation to the child's parent | Brother-in-law |
| Relation to the child's aunt/uncle | Spouse |
| Relation to the child's grandparent | Spouse's parent |
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What You'll Learn

The child is your niece or nephew
The child of your brother-in-law is your niece or nephew. This is true whether your brother-in-law is the sibling of your spouse or the spouse of your sibling. This type of kinship is called affinity, and it is a relationship by marriage, not by blood. If necessary, you can specify whether the child is your "niece/nephew by marriage", as opposed to "by blood" or "by adoption".
In-law relationship terms are always written with hyphens, and the plural is formed on the part before the "in-law". For example, "brothers-in-law" and not "brother-in-laws". The only exception is the general term "in-laws", which is always plural.
In Indian English, the wife of one's brother-in-law can be referred to as a "co-sister", and the husband of one's sister-in-law can be referred to as a "co-brother".
It is worth noting that, in English, there are relatively few kinship terms compared to many other languages. This can make it challenging to describe certain relationships accurately and succinctly.
Additionally, the terminology for relationships can be flexible, especially in everyday speech. For example, following a divorce, some people may continue to refer to their former spouse's children as their nieces and nephews, and there is no reason why the children couldn't continue to call them "Aunt" or "Uncle".
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No direct relation
A brother-in-law is the spouse of one's sibling or the sibling of one's spouse. A sibling-in-law is related by a type of kinship called affinity, like all in-law relationships. These relationships are not direct relations as they are not connected by blood.
In-law relationship terms always have hyphens, and the plural is formed from the part before the "in-law". For example, the plural of "brother-in-law" is "brothers-in-law", not "brother-in-laws". The only exception is the general term "in-laws", which is always plural.
The brother of your spouse is your brother-in-law, and your siblings' spouses are also your brothers-in-law. The children of your siblings-in-law are your nieces and nephews, with the specification "by marriage" if necessary. However, if your spouse has children from a previous marriage, those are your stepchildren, not sons-in-law or daughters-in-law.
The English language has relatively few kinship terms compared to other languages, which can make it challenging to describe certain relationships. For example, there is no simple term for the relationship between your son's brother-in-law and yourself. While you can refer to them as Uncle or Aunt when talking to your grandchildren, the only way to describe the relationship to a third party is to say "my son's brother-in-law" or "my son's sister-in-law".
In conclusion, while the children of your siblings-in-law are your nieces and nephews, there is no direct relation between you and your brother-in-law's child. The relationship is one of affinity or kinship by marriage, and the specific term used to describe the relationship depends on the context and the generation of the person referring to the child.
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Cousins by marriage once removed
The concept of "cousins by marriage once removed" is a complex one, and it's important to understand the individual terms involved.
Firstly, cousins by marriage are individuals who are considered cousins due to a marriage, rather than a blood relation. For example, the spouse of your cousin or your spouse's cousin would be your cousin by marriage.
Secondly, the term "once removed" indicates that there is a one-generation gap between the cousins. This could mean that the cousin by marriage is from either the generation above or below you. For instance, they could be your parent's cousin by marriage or your cousin's child who is a cousin by marriage.
Combining these concepts, "cousins by marriage once removed" would refer to individuals who are the spouse of your parent's cousin or your cousin's child's spouse. Alternatively, it could refer to your spouse's parent's cousin or your spouse's cousin's child.
It's worth noting that kinship terminology in English can be quite limited and complex, especially when it comes to relationships by marriage. The terms used to describe these relationships can vary, and there may not always be a precise or universally accepted term.
In any case, understanding family relationships and dynamics can be fascinating and enriching, and it's always a good idea to clarify and specify when explaining these relationships to others.
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Your brother-in-law's child
The English language has relatively few kinship terms compared to many other languages. This is particularly the case for relationships by marriage.
The child of your brother-in-law is not directly related to you by blood. They are the child of your sibling's spouse or your spouse's sibling. Your brother-in-law's sister is your sister-in-law, and their brother is also your brother-in-law.
In Indian English, the wife of your brother-in-law is a co-sister, and the husband of your sister-in-law is a co-brother.
The term "in-law" indicates that the relationship is by marriage and not by blood. Your in-laws are people you are related to by marriage. Your spouse's parents are your in-laws, and their children are your stepchildren.
There is no specific term for your relationship with your brother-in-law's parents. Likewise, there is no term for the relationship between your son's brother-in-law and yourself.
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Your sibling's niece or nephew
The brother of your spouse is called your brother-in-law, and your spouse's sister is your sister-in-law. Similarly, your siblings' spouses are also your brother-in-law or sister-in-law. The children of your siblings are your nieces and nephews. By extension, the children of your siblings-in-law are also your nieces and nephews, though it may be specified whether "by marriage", as opposed to "by blood" or "by adoption".
In-law relationship terms are always written with hyphens, and the plural is formed on the part before the "in-law". For example, "brothers-in-law" and not "brother-in-laws". The only exception is the general term "in-laws", which is always plural.
The husband of your daughter is your son-in-law, and the wife of your son is your daughter-in-law. If your spouse has children from a previous marriage, those are your stepchildren, not sons-in-law or daughters-in-law. You are their stepfather or stepmother, not their father-in-law or mother-in-law.
In Indian English, 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-law relationships are a type of kinship called affinity, which means they are related by marriage and not by blood. If you and your spouse divorce, some people may still refer to their ex-spouse's parents as their mother-in-law or father-in-law, especially if they are on good terms. There is also no reason why you can't continue to call their children your nieces and nephews or why they shouldn't continue to call you aunt or uncle.
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Frequently asked questions
Your relationship to your brother-in-law's child is that of a niece or nephew. If necessary, it can be specified as "niece/nephew by marriage" as opposed to "by blood" or "by adoption".
Your child and your brother-in-law's child are cousins.
Your brother-in-law's parents are your brother/sister-in-law's parents-in-law. There is no specific word to describe their relationship to you.
Your brother-in-law's sibling is your sister/brother-in-law.






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