Sibling-in-law - Wikipedia

Spouse's sibling or sibling's spouse "Brother-in-law" and "Sister-in-law" redirect here. For other uses, see Brothers in Law (disambiguation) and Sisters in Law (disambiguation).

Example of the spouse of one's sibling

Saul Kasey Jonathan Mary Anne David

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

A sibling-in-law is the spouse of one's sibling, the sibling of one's spouse, or the spouse of one's spouse's sibling. In Indian English the latter can be referred to as a co-sibling (specifically a co-sister, for the wife of one's sibling-in-law,[1] or co-brother, for the husband of one's sibling-in-law).[2]

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 sibling-in-law.

Relationships

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Siblings-in-law are related by a type of kinship called affinity like all in-law relationships. All of these are relations which do not relate to the person directly by blood.[3]

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".

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.

Culture

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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."[4]

In Islamic law (Sharia)[5] and Jewish law (halakha),[6] 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.[7]

See also

[edit] Look up sibling-in-law in Wiktionary, the free dictionary.

• Nephew and niece
• Cousins-in-law
• Affinity (law)

References

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1. ^ "Co-Sister". Cambridge Dictionary. Retrieved 18 April 2020.
2. ^ "Co-Brother". Cambridge Dictionary. Retrieved 18 April 2020.
3. ^ Cambridge Dictionaries Online. "Family: non-blood relations".
4. ^ Yoshimura, C.G (2010). "The experience and communication of envy among siblings, siblings-in-law, and spouses". Journal of Social and Personal Relationships.
5. ^ Quran 4:23 : "˹Also˺ forbidden to you for marriage...two sisters together at the same time"
6. ^ Leviticus 18:16, 18:18.
7. ^ Deuteronomy 25:5–10.

v t e Family
History Rights Household Nuclear family Extended family Conjugal family Immediate family Matrifocal family
First-degree relatives	Parent mother father Child son daughter Sibling brother sister
Second-degree relatives	Grandparent Grandchild Uncle/Aunt Niece and nephew
Third-degree relatives	Great-grandparent Great-grandchild Great-uncle/Great-aunt Cousin
Family-in-law	Spouse wife husband Parent-in-law Sibling-in-law Child-in-law daughter-in-law son-in-law
Stepfamily	Stepparent stepfather stepmother Stepchild Stepsibling
Kinship terminology	Kinship Australian Aboriginal kinship Adoption Affinity Consanguinity Disownment Divorce Estrangement Family of choice Fictive kinship Marriage Nurture kinship Chinese kinship Hawaiian kinship Sudanese kinship Eskimo kinship Iroquois kinship Crow kinship Omaha kinship
Genealogyand lineage	Bilateral descent Cadet branch Common ancestor Family name Heirloom Heredity Inheritance Lineal descendant collateral descent Matrilineality Patrilineality Progenitor Clan Royal descent Family trees Pedigree chart Genogram Ahnentafel Genealogical numbering systems Seize quartiers Quarters of nobility
Relationships	Agape (parental love) Eros (marital love) Philia (brotherly love) Storge (familial love) Filial piety Polyfidelity
Holidays	Mother's Day U.S. Father's Day Father–Daughter Day Siblings Day National Grandparents Day Parents' Day Children's Day Japan Family Day Canada American Family Day International Day of Families National Family Week UK National Adoption Day
Related	Breadwinner model Single parent Wedding anniversary Godparent Birth order Only child Middle child syndrome Sociology of the family Museum of Motherhood Astronaut family Dysfunctional family Domestic violence Incest Sibling abuse Sibling estrangement Sibling rivalry