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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.
The coefficient of relationship is a measure of the degree of consanguinity (or biological relationship) between two individuals. The term coefficient of relationship was defined by Sewall Wright in 1922, and was derived from his definition of the coefficient of inbreeding of 1921.
Roman civil law prohibited marriages within four degrees of consanguinity. [3] This was calculated by counting up from one prospective partner to the common ancestor, then down to the other prospective partner. [4] The first prohibited degree of consanguinity was a parent-child relationship while a second degree would be a sibling relationship.
Consanguinity is practiced regardless of religious influences and is a result of cultural, historical, regional, and socio-economic factors. [2] [6] A greater number of consanguineous marriages are observed in rural areas compared to urban areas within the same region. This is attributed to the tendency of individuals in rural areas to marry at ...
The church also prohibited affinity to the same seven degrees. While the impediment of affinity is close to but not as compelling as that of consanguinity, the reasoning behind the prohibited degrees of affinity being treated the same as that of consanguinity is the nearness to the blood relatives by the very act of sexual intercourse. [8]
For each additional degree of the cousin relationship, consanguinity is reduced by a quarter as the generations of separation increase by one on both sides. [16] Half cousins have half the consanguinity of ordinary cousins as they have half the common ancestors (i.e. one vs two).
It further lists specific degrees of consanguinity and marriage before dissolving a prior union as prohibitions to marriage. [140] The Crow Tribe has steadily adopted Christianity over the centuries, and it passed a resolution to its governing documents to "proclaim Jesus Christ as Lord of the Crow Indian Reservation", and thus looks unlikely ...
The degree of affinity is considered the same as the consanguineal level a couple was joined, so that, for example, the degree of affinity of a husband to his sister-in-law is two, the same as the wife would be to her sister on the basis of consanguinity. The degree to the wife’s parent or child is one, and to an aunt or niece it is three ...