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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.
A cousin once removed means they’re from the generation immediately above or below you. So your first cousin once removed would be your first cousin’s child or your parent’s first cousin.
As a working definition, unions contracted between persons biologically related as second cousins or closer (r ≥ 0.03125) are categorized as consanguineous. This arbitrary limit has been chosen because the genetic influence in marriages between couples related to a lesser degree would usually be expected to differ only slightly from that ...
Often, however, I do hear black folks refer to or intro someone as "My first cousin", "her third cousin", etc when that relationship is known -- but "removed cousin" is never used: a "first cousin-once-removed" is a "second cousin" and everyone gets moved back a degree accordingly, so when a "third cousin" is mentioned what is invariably meant ...
When the subject and the relative have an additional removal they are cousins. A cousin with minimal removal is a first cousin, i.e. the child of the subjects uncle or aunt. Degrees of collaterality and removals are used to more precisely describe the relationship between cousins.
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.
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