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Several states of the United States prohibit cousin marriage. [1] [2] As of February 2014, 24 U.S. states prohibit marriages between first cousins, 19 U.S. states allow marriages between first cousins, and seven U.S. states allow only some marriages between first cousins. [3] Five states prohibit first-cousin-once-removed marriages. [4]
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 cousin once removed: 12.5% (2 −3) 6: 6: 3: half-second cousin: 1.5625% (2 −6) 4: 6: 3: double-second cousin: 6.25% (2 −4) 5: 5: 4: half-great-grandaunt / half-great-granduncle / half-great-grandniece / half-great-grandnephew: 3.125% (2 −5) 6: 6: 4: half-first cousin twice removed: 1.5625% (2 −6) 4: 6: 4: double-first ...
In some communities and time periods, cousin marriage is allowed or even encouraged; in others, it is taboo, ... first cousin once removed: 6.25% second cousin:
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 ...
When the removal is not specified, no removal is assumed. [1] [2] Various governmental entities have established systems for legal use that can precisely specify kinship with common ancestors any number of generations in the past; for example, in medicine and in law, a first cousin is a type of third-degree relative. [citation needed]
If one considers as a function of time t the number of a given individual's ancestors who were alive at time t, it is likely that for most individuals this function has a maximum at around 1200 AD. It was suggested in 1985 that everyone on Earth is at most 50th cousin to everyone else, based on a relatively random mating model. [5]
1 Some states recognize marriages performed elsewhere, especially when the spouses were not residents of the state when married. 30 U.S. states prohibit most or all marriage between first cousins. Six states prohibit marriages between first cousins once removed. [14]