Sibling-in-law


Commonly a sibling-in-law is the relationship that exists between a persons sibling and the persons spouse. This relationship is reciprocal, as it includes relationship from sibling to spouse and from spouse to sibling. More commonly a sibling-in-law is referred to as a brother-in-law for a male sibling-in-law and a sister-in-law for a female one.[1]

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David and Jonathan became brothers-in-law when David married Jonathan's sister Michal

Less frequently sibling-in-law refers to the reciprocal relationship between a persons sibling and their spouse's sibling.[2] In Indian English this can be referred to as a co-sibling (specificity a co-sister[3] or co-brother[4]).

Culture

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]

See also

References
  1. Cambridge Dictionaries Online. "Family: non-blood relations".
  2. OED entry for 'brother-in-law' describes this as 'uncommon':
  3. "Co-Sister". Cambridge Dictionary. Cambridge Dictionary. Retrieved 18 April 2020.
  4. "Co-Brother". Cambridge Dictionary. Cambridge Dictionary. Retrieved 18 April 2020.
  5. Yoshimura, C.G (2010). "The experience and communication of envy among siblings, siblings-in-law, and spouses". Journal of Social and Personal Relationships.
  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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