Question: What is it called when a brother marries his sister?

A sibling-in-law is the spouse of your sibling, or the sibling of your spouse, or the person who is married to the sibling of your 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.

When brother of a family marry sister of another family it is called as?

3 Answers. In English, the preferred term appears to be double in-law marriage. The two couples become double in-laws or simply double couples.

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