
English is limited in its terminology for relationships beyond close blood relatives, especially when it comes to relationships by marriage. Any relationship term ending with '-in-law' indicates that the relationship is by marriage and not by blood. In this case, the son of your brother-in-law is your co-nephew-in-law, or your nephew-in-law.
| Characteristics | Values |
|---|---|
| Relationship | Nephew |
| Relation by blood | No |
| Relation by marriage | Yes |
| Relation in terms of kinship | Co-nephew-in-law |
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What You'll Learn

The son of your brother-in-law is your nephew
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. My father-in-law is the father of my spouse, and my mother-in-law is the mother of my spouse.
English is limited in terms of relationships beyond close blood relatives. This is especially true for relationships by marriage. While your son has a brother-in-law, your grandson has an uncle, and you are the brother-in-law's sister's father-in-law, there is no simple term for the brother-in-law's relationship to you.
The term "co-nephew-in-law" has been suggested, stemming from translations of South Indian languages. However, it is wordy and not commonly used. In practice, you would likely refer to the child of your brother-in-law as your nephew, and they would refer to you as their uncle or aunt.
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'In-law' indicates a relationship by marriage, not blood
The English language has a limited vocabulary for describing relationships beyond close blood relatives. This is especially true for relationships by marriage. The suffix '-in-law' indicates a relationship by marriage, not by blood. This means that one of you is a blood relative, while the other is related by marriage.
Your brother-in-law's son is not your nephew. The son of your brother-in-law is your co-nephew-in-law. The term 'co-sibling-in-law' is believed to have originated from translations of South Indian languages. However, it is worth noting that this term is quite wordy and not commonly used.
In English law, your sister-in-law's nieces and nephews are not related to you. However, if they call you 'aunt' or 'uncle', then 'nephew-in-law' or 'niece-in-law' might be suitable terms to describe the relationship. You are their aunt or uncle for all practical purposes, but since you do not share any common ancestors, you are not related at all.
It is important to note that the terms used to describe relationships can vary depending on the culture and language. For example, the term 'aunt-by-law' usually refers to the wife of one's parent's brother, but this is not a universal definition.
In summary, the '-in-law' suffix indicates a relationship by marriage, and the specific terms used can vary depending on cultural and linguistic contexts.
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The term 'co-nephew-in-law' is sometimes used
The English language has a limited vocabulary for describing relationships beyond close blood relatives. This is especially true for relationships by marriage. The term "co-nephew-in-law" is sometimes used to describe the relationship between the son of one's brother-in-law and oneself. This term is believed to have originated from translations of South Indian languages, which may explain its uncommon usage.
The relationship between an individual and their brother-in-law's son can be complex to define due to the lack of specific kinship terminology in the English language. While "co-nephew-in-law" may be used, it is not a widely recognized term. It is worth noting that the suffix "-in-law" typically signifies a relationship formed through marriage rather than blood.
In certain cultures and traditions, the usage of kinship terms may vary. For example, divorce can impact how individuals choose to address their former in-laws and their extended families. Some individuals may continue to refer to their ex-spouse's relatives as in-laws even after divorce, especially if they remain on good terms.
The English language's limited kinship vocabulary can lead to creative solutions when describing relationships. While "co-nephew-in-law" may be one option, individuals may also opt for simpler explanations, such as referring to the person by name or providing additional context when introducing them to others. Ultimately, the chosen terminology depends on personal preference and the specific family dynamics involved.
It is worth noting that in some cultures, the term nephew-in-law may be used more broadly to refer to a relative by marriage, even if there is no direct blood relation. This usage can vary depending on cultural and regional influences.
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Aunt-by-courtesy is another term for this relationship
A nephew is defined as a son of one's brother, sister, brother-in-law, or sister-in-law. A brother-in-law is the brother of one's spouse, or the husband of one's sibling. Therefore, the son of your brother-in-law is your nephew.
English is limited in its terminology for relationships beyond close blood relatives, especially when it comes to relationships by marriage. For instance, there is no simple term to describe the relationship between the parent of your son's brother-in-law and the brother-in-law themselves. In this case, you would refer to them as "my son's brother-in-law" when explaining the relationship to a third party.
When speaking to your grandson, it would be correct to refer to your son's brother-in-law as "Uncle [name]". If your son's brother-in-law's wife is known as "Aunt [name]" to your grandson, she is your son's sister-in-law.
The term "aunt-by-courtesy" is another way to refer to this relationship. This term is used to describe someone who is older than you, whom you would not address by their first name, but who is a family friend, perhaps of your parents. This is similar to the term "uncle-by-courtesy", which is an honorific used in the same way.
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Your brother is not related to your in-laws
The English language has a limited vocabulary for describing relationships beyond close blood relatives. Any relationship term ending with "-in-law" indicates that the relationship is by marriage and not by blood.
Your brother's relationship to your in-laws depends on the gender of your spouse. If your spouse is male, your brother is your spouse's brother-in-law. If your spouse is female, your brother is your spouse's sister's brother-in-law or co-brother-in-law.
Your brother's relationship to your in-laws' children is also dependent on the gender of your spouse. If your spouse is male, your brother is the uncle to your in-laws' children, and those children are your brother's nephews or nieces-in-law. If your spouse is female, your brother is the uncle to your in-laws' children, and those children are your brother's co-nephews or co-nieces-in-law.
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Frequently asked questions
Yes, your brother-in-law's son is your nephew.
If your brother-in-law is your spouse's sibling, then your brother-in-law's son is your son, and therefore also your nephew.
If your brother-in-law is your sibling's spouse, then your brother-in-law's son is your nephew-in-law.
Yes, "co-nephew-in-law" is a term that has stemmed from translations of South Indian languages.
If your brother-in-law is your ex-spouse's sibling, then their children are not your nephews or nieces, but you can still refer to them as such if you are on good terms.





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