"In-laws" are not blood relations. One's brother in law is one's spouse's brother.
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AvangiOne's brother in law is one's spouse's brother.Or one's sister's husband!
Grammar GeekMy husband's sister's husband is my brother-in-law.I never knew that. Thanks!
Grammar GeekMy husband's sister's husband is my brother-in-law..Not "brother-in-law-in-law"?