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For other uses, see Brothers in Law.

Sibling-in-law is a gender-neutral term to refer to a brother-in-law or sister-in-law.

A brother-in-law (plural brothers-in-law) is the brother of one's spouse or the husband of one's sibling.

A sister-in-law (plural sisters-in-law) is the sister of one's spouse or the wife of one's sibling. Relative to a woman, the latter case (typically her husband's brother's wife; that is, the two women have married brothers) is occasionally called a 'co-sister-in-law', as they are each the sister-in-law of the other's husband.

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