GNU Collaborative International Dictionary of English

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Found one definition

1.       
   in-law (?), n. A person who is related by marriage, as distinguished from a blood relative; esp. mother-in-law (the mother of one's spouse), father-in-law  (the father of one's spouse), brother-in-law (the brother of one's spouse, or husband of one's spouse's sister), sister-in-law  (the sister of one's spouse, or wife of one's spouse's brother).
   
   [PJC]