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Your siblings' spouse's family or your spouse's siblings' spouse's family are your family-in-law. (ie- no blood or marriage ties, yet somehow still family.)
My sister's nephews by marriage are my family-in-law. OR
My brother-in-law's wife's family is my family-in-law. OR
My sister's in-laws are my family-in-law.
by cindy-gator March 15, 2011
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