Sibling-in-law

Jesse| | Nitzevet| | Saul| | Kasey

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| | David| | Michal| | Jonathan

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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. ↑ 3.0 3.1 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. http://spr.sagepub.com/content/27/8/1075.short.
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.

* v
* t
* e

Family

* History
* Household
* Nuclear family
* Extended family
* Conjugal family
* Immediate family
* Matrifocal family
* Stepfamily
* 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
* Great-Uncle
* Great-Aunt
* 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 terminology|

* Kinship
* Australian Aboriginal kinship
* Adoption
* Affinity
* Consanguinity
* Disownment
* Divorce
* Estrangement
* Fictive kinship
* Marriage
* Nurture kinship
* Hawaiian kinship
* Sudanese kinship
* Eskimo kinship
* Iroquois kinship
* Crow kinship
* Omaha 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
* Incest

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