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The extent to which the risk increases depends on the degree of genetic relationship between the parents; so the risk is greater in mating relationships where the parents are close relatives, but for relationships between more distant relatives, such as second cousins, the risk is lower (although still greater than the general population).
The coefficient of relationship is sometimes used to express degrees of kinship in numeric terms in human genealogy. In human relationships, the value of the coefficient of relationship is usually calculated based on the knowledge of a full family tree extending to a comparatively small number of generations, perhaps of the order of three or four.
Data on cousin marriage in the United States are sparse. It was estimated in 1960 that 0.2% of all marriages between Roman Catholics were between first or second cousins, but no more recent nationwide studies have been performed. [181] It is unknown what proportion of that number were first cousins, which is the group facing marriage bans.
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A cousin is a relative that is the child of a parent's sibling; this is more specifically referred to as a first cousin. More generally, in the kinship system used in the English-speaking world, a cousin is a type of relationship in which relatives are two or more generations away from their most recent common ancestor. For this definition ...
The relationships that give rise to the impediment have varied over time. Marriages and sexual relations between people in an affinity relationship are regarded as incest . Today, the relevant principle within the Catholic Church is that "affinity does not beget affinity"—i.e., there is no affinity between one spouse's relatives and the other ...
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 ...
In law and in cultural anthropology, affinity is the kinship relationship created or that exists between two people as a result of someone's marriage. It is the relationship each party in the marriage has to the family of the other party in the marriage. It does not cover the marital relationship itself. Laws, traditions and customs relating to ...
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