What is your brother's wife called?
Isabella Harris
Updated on January 17, 2026
You also call your own siblings' spouses your brother-in-law (the husband of your sibling) or sister-in-law (the wife of your sibling).
brother-in-law
A sibling-in-law is the spouse of one's sibling, or the sibling of one's spouse, or the person who is married to the sibling of one's spouse. More commonly a sibling-in-law is referred to as a brother-in-law for a male sibling-in-law, and a sister-in-law for a female one.
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What should I call my brother's wife?
sister-in-lawthe wife of your brother.