What do I call my brother-in-law's sister?

Answer

A person's brother-in-law's sister is potentially that person's wife, sister-in-law or no relation whatsoever. What one calls his brother-in-law's sister depends on how that brother-in-law is related and which sister it is.

A male becomes a brother-in-law to someone in one of three ways. He is the brother of one's spouse, the husband of one's sister or the husband of one's spouse's sister. In the first case, the sister is either a spouse or a sister-in-law. In the second and third scenarios, the sister is no relation at all. She is called either by her first name or a title and her last name depending on the closeness of the relationship.

Explore this Topic
Sister-in-law is a relative by marriage and is the sister of one's spouse or the wife of one's brother. The wife of the brother of one's spouse can also be categorised ...
Oddly enough, English does not have specific words for the husband of one's sister in law. You would be correct in either calling him your brother in law, or ' ...
You would call your brother's wife your sister-in-law. You could also simply refer to her by her first name or as your brother's wife. ...
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