How do you call the daughter of your brother-in-law?

Answer 1

We don't have a specific word for this kin relationship in English. If you think of your daughter-in-law as being like your own daughter, then her sister would be like your daughter too, and in that case the sister's son would be like your grandson. I have never heard anyone use the term "grandson-in-law," but it's possible to use such a word. I would use it if I had a relationship with this boy (in some families the mother-in-law might not ever even meet this relative). Otherwise, "daughter-in-law's sister's son" is the only way to precisely describe it.

Answer 2

They are typically referred to as your niece, if the brother-in-law is married to your sister or you are married to their sibling.

If your brother-in-law is the husband of your sister, the daughter is your niece.

If your brother-in-law is the brother of your spouse, his daughter is your spouse's niece, and is commonly considered to be your niece, as well.

Answer 3

Your father's sister, or your mother's sister, is your aunt. Your father's brother, or your mother's brother is your uncle.

Answer 4

Your uncle's daughter is your cousin.

Answer 5

cousin.