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A first-degree relative (FDR) is a person's parent (father or mother), sibling (brother or sister) or child (son or daughter). [1] It constitutes a category of family members that largely overlaps with the term nuclear family, but without spouses. [2] If the persons are related by blood, the first degree relatives share approximately 50% of ...
The degree of kinship between two people may give rise to several legal issues. Some laws prohibit sexual relations between closely related people, referred to as incestuous. Laws may also bar marriage between closely related people, which are almost universally prohibited to the second degree of consanguinity.
Global prevalence of consanguine marriage (marriage between two family members who have coefficient of relationship r = 3.125% or higher), illustrating a higher prevalence of cousin marriage in the Middle East in 2013. Globally, 8.5% of children have consanguineous parents, and 20% of the human population live in communities practicing endogamy.
The first prohibited degree of consanguinity was a parent-child relationship while a second degree would be a sibling relationship. A third degree would be an uncle/aunt with a niece/nephew while fourth degree was between first cousins. [4]
The Code of Canons of the Eastern Churches of the Eastern Catholic Church holds in Canon 809 that affinity invalidates marriage in the direct line in any degree, and also in the collateral line to the second degree, thus prohibiting someone from marrying their sibling-in-law without first receiving a dispensation. [12]
Worldwide, more than 10% of marriages are between first or second cousins. [2] Cousin marriage is an important topic in anthropology and alliance theory. [3] In some cultures and communities, cousin marriages are considered ideal and are actively encouraged and expected; in others, they are seen as incestuous and are subject to social stigma ...
Kinship terminology is the system used in languages to refer to the persons to whom an individual is related through kinship.Different societies classify kinship relations differently and therefore use different systems of kinship terminology; for example, some languages distinguish between consanguine and affinal uncles (i.e. the brothers of one's parents and the husbands of the sisters of ...
More commonly, they are known as in-laws or family-in-law, with affinity being usually signified by adding "-in-law" to a degree of kinship. This is standard for the closest degrees of kinship, such as parent-in-law , child-in-law , sibling-in-law , etc., but is frequently omitted in the case of more extended relations.