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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 ...
Double first cousins are descended from two pairs of siblings, and have the same genetic similarity as half-siblings. In unions between double first cousins, the highest inbreeding coefficients are reached, with an (F) of 0.125, for example among Arabs and uncle-niece marriages in South India.
first cousin twice removed: 3.125% (2 −5) 6: 7: 4: second cousin once removed: 1.5625% (2 −6) 7: 8: 4: third cousin: 0.78125% (2 −7) 5: 5: 5: great-great-great-grandmother / great-great-great-grandfather / great-great-great-granddaughter / great-great-great-grandson: 3.125% (2 −5) 5: 6: 5: great-great-grandaunt / great-great-granduncle ...
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.
His father and two of his great-grandfathers married their nieces. His paternal grandparents were first cousins once removed, but they comprised two of the seven marriages because they were also parents to his maternal grandmother. His maternal grandparents' marriage and the final marriage of great-grandparents was between first cousins.
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. [177] It is unknown what proportion of that number were first cousins, which is the group facing marriage bans.
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In Pakistan, where there has been cousin marriage for generations and the current rate may exceed 50%, one study estimated infant mortality at 12.7 percent for married double first cousins, 7.9 percent for first cousins, 9.2 percent for first cousins once removed/double second cousins, 6.9 percent for second cousins, and 5.1 percent among ...