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|Noun||1.||relative-in-law - a relative by marriage|
brother-in-law - a brother by marriage
daughter-in-law - the wife of your son
father-in-law - the father of your spouse
relative, relation - a person related by blood or marriage; "police are searching for relatives of the deceased"; "he has distant relations back in New Jersey"
mother-in-law - the mother of your spouse
sister-in-law - the sister of your spouse
son-in-law - the husband of your daughter