Sibling-in-law































































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.[1]



Sibling-in-law is a word phrase referring to the sibling of one's spouse, or the spouse of one's sibling, or (more rarely)[2] taken one step further by referring to the spouse of one's spouse's sibling. All of these are relations which do not relate to the person directly by blood.[3] Alternatively, the spouse of your spouse's sibling may be called a co-sibling-in-law[4], or co-sibling.


More commonly this is referred to by the gendered terms: brother-in-law, or co-brother-in-law for a male non-blood sibling, and sister-in-law or co-sister-in-law for a female non-blood sibling.[3]


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."[5]


In Islamic law (shariʿa)[6] and Jewish law (halakhah)[7] 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.[8]


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







  • Nephew and niece

  • Cousins-in-law

  • Affinity (law)



References





  1. ^ 1 Samuel 18:20–27.


  2. ^ OED entry for 'brother-in-law' describes this as 'uncommon': [1]


  3. ^ ab Cambridge Dictionaries Online. "Family: non-blood relations".


  4. ^ Wiktionary, 'co-sibling-in-law': https://en.wiktionary.org/wiki/co-sibling-in-law


  5. ^ Yoshimura, C.G (2010). "The experience and communication of envy among siblings, siblings-in-law, and spouses". Journal of Social and Personal Relationships..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


  6. ^ "Forbidden...that you should marry two sisters at one time"[Quran 4:23 (Translated by al-quran.info)]


  7. ^ Leviticus 18:16, 18:18.


  8. ^ Deuteronomy 25:5–10.










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