Sibling - in - law - Wikipedia Sibling - in - law This article may be confusing or unclear to readers. In particular, the first paragraph mentions both ' spouse ' and ' sibling ' excessively, and it can be difficult to understand what the paragraph means. Please help us clarify the article. There might be a discussion about this on the talk page. ( July 2018 ) For other uses, see Brothers in Law ( disambiguation ) and Sisters in Law ( disambiguation ). Jesse Nitzevet Saul Kasey David Michal Jonathan David and Jonathan, sworn friends and confidants, became brothers - in - law when David married Jonathan 's sister Michal. One 's sibling - in - law is one 's spouse 's sibling, or one 's sibling 's spouse, or ones 's spouse 's sibling 's spouse. By gender, this is specified as brother - in - law for one 's spouse 's brother, one 's sibling 's husband, or one 's spouse 's sibling 's husband, and sister - in - law for the one 's spouse 's sister, one 's sibling 's wife, or one 's spouse 's sibling 's wife. Just like other affines, or `` in - laws '', siblings - in - law are related by a type of kinship called affinity. Just like the children of one 's siblings, the children of one 's siblings - in - law are called simply nieces and nephews -- if necessary, specified whether `` by marriage '', as opposed to `` by blood '' or `` by adoption ''. One study, examining the issue of envy in the triadic system of sibling, sibling - in - law and spouse, concluded that `` The sibling - in - law relationship shared similarities with both spousal and sibling relationships '' and that `` Relational closeness and satisfaction for all relationships in the triad were correlated. '' In Islamic law ( shariʿa ) and Jewish law ( halakhah ) sexual relations between siblings - in - law are prohibited as incestuous, unless the spouse is no longer married. Conversely, in Judaism there was the custom of yibbum, whereby a man had a non-obligatory duty to wed his deceased brother 's childless widow so she might have progeny by him. If one pair of siblings is married to another pair of siblings, the siblings - in - law are thus doubly - related, each of the four both through one 's spouse and through one 's sibling, while the children of the two couples are double cousins. See also Look up sibling - in - law in Wiktionary, the free dictionary. Nephew and niece Cousins - in - law Affinity ( law ) References Jump up ^ 1 Samuel 18 : 20 -- 27. Jump up ^ Cambridge Dictionaries Online. `` Family : non-blood relations ''. Jump up ^ Yoshimura, C.G ( 2010 ). `` The experience and communication of envy among siblings, siblings - in - law, and spouses ''. Journal of Social and Personal Relationships. Jump up ^ `` Forbidden... that you should marry two sisters at one time '' Jump up ^ Leviticus 18 : 16, 18 : 18. Jump up ^ Deuteronomy 25 : 5 -- 10. Family History Household Nuclear family Extended family Conjugal family Immediate family Matrifocal family Blended family Dysfunctional family Polyfidelitous families First - degree relatives Parent father mother Child son daughter Sibling brother sister Second - degree relatives Grandparent Grandchild Aunt Uncle Niece and nephew Third - degree relatives Great - grandparent Great - grandchild Grandnephew and grandniece Cousin Family - in - law Spouse wife husband Parents - in - law Siblings - in - law Son - in - law Daughter - in - law Stepfamily Stepfather Stepmother Stepchild Stepsibling Kinship Australian Aboriginal kinship Adoption Affinity Consanguinity Disownment Divorce Estrangement Fictive kinship Marriage Nurture kinship Lineage Bilateral descent Common ancestor Family name Family tree Genealogy Heirloom Heredity Inheritance Lineal descendant Matrilineality Patrilineality Pedigree chart Progenitor Relationships Agape ( parental love ) Eros ( marital love ) Filial piety Storge ( familial love ) Holidays Mother 's Day U.S. Father 's Day Father - Daughter Day Siblings Day National Grandparents Day Parents ' Day Children 's Day Family Day Canada American Family Day National Family Week UK Related Wedding anniversary Sociology of the family Museum of Motherhood Retrieved from `` https://en.wikipedia.org/w/index.php?title=Sibling-in-law&oldid=850931121 '' Categories : Family - in - law Genealogy Kinship and descent Sibling Hidden categories : Wikipedia articles needing clarification from July 2018 All Wikipedia articles needing clarification Talk About Wikipedia Emiliàn e rumagnòl नेपाली 日本 語 سنڌي Türkçe Українська Zazaki Edit links This page was last edited on 18 July 2018, at 22 : 43 ( UTC ). Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: how do you call your brother in law wife
Answer: sister-in-law