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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.
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.
There is no significant difference in the number of surviving children in first-cousin marriages because this compensates for the observed increase in child mortality. [242] However, there is a large increase in fertility for third and fourth cousin marriages, whose children exhibit more fitness than both unrelated individuals or second cousins ...
Ever wondered what your mother’s cousin’s son is to you? Or just what exactly “twice removed” means? Here’s a guide to help you find the right term for those complicated family ties.
Marriages between first cousins are legal in 19 states. For premium support please call: 800-290-4726 more ways to reach us
David Lean (1908–1991), British film director, and his first cousin, Isabel Lean (his first wife) [30] Charles Lilburn Lewis and his first cousin, Lucy Jefferson Lewis; Li Ka-shing (born 1928), founder of Cheung Kong Holdings, married his first cousin Chong Yuet Ming (c. 1935 – 1990) [31] John Amory Lowell and his first cousin, Susan Cabot ...
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 ...
Thus, a parent and child pair has a value of r=0.5 (sharing 50% of DNA), siblings have a value of r=0.5, a parent's sibling has r=0.25 (25% of DNA), and first cousins have r=0.125 (12.5% of DNA). These are often expressed in terms of a percentage of shared DNA but can be also popularly referred to as % of genes although that terminology is ...