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First, second, and third cousins (and so on unto infinity cousins) are an equal number of generations removed from the common ancestor. First cousins are both the second generation removed from ...
In clinical genetics, consanguinity is defined as a union between two individuals who are related as second cousins or closer, with the inbreeding coefficient (F) equal or higher than 0.0156, where (F) represents the proportion of genetic loci at which the child of a consanguineous couple might inherit identical gene copies from both parents.
The terms cousin-uncle/aunt and cousin-niece/nephew are sometimes used to describe the direction of the removal of the relationship, [7] especially in Mennonite, [8] Indian, and Pakistani [citation needed] families. These terms relate to a first cousin once removed, uncle/aunt referring to an older generation and niece/nephew for younger ones.
Six states (Kentucky, Nevada, Ohio, Tennessee, Utah, Washington, Wisconsin) prohibit first-cousin-once-removed marriages. [4] Kentucky [5] and Nevada [6] are the only two states that prohibit marriages between second cousins. New York is the only state that allows avunculate marriage. [7]
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This is a simple family tree that illustrates the definitions of various types of cousins (e.g. "second cousin twice removed"). ... first cousin once removed ...
This makes President Carter a half second-cousin of producer Berry Gordy. He is also a half second-cousin, once removed, of LMFAO rapper Redfoo (Stefan Kendal Gordy). s_bukley/depositphotos.
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.