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As aunt/uncle and niece/nephew are separated by one generation, they are an example of a second-degree relationship. Unless related by marriage, they are 25% or more related by blood if the aunt/uncle is a full sibling of one of the parents, or 12.5% if they are a half-sibling .
Ilsley Boone (1879–1968) and his first cousin, Ella Murray "Mae" Boone, founder of the American Sunbathing Association, which today is known as the American Association for Nude Recreation James Boswell (1740–95) (biographer of Samuel Johnson ) and his first cousin Margaret Montgomerie married in 1769.
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. For this definition ...
For example, because the entire Amish population is descended from only a few hundred 18th-century German-Swiss settlers, the average coefficient of inbreeding between two random Amish is higher than between two non-Amish second cousins. [230] First-cousin marriage is taboo among Amish, but they still have several rare genetic disorders.
The extent to which the risk increases depends on the degree of genetic relationship between the parents; so the risk is greater in mating relationships where the parents are close relatives, but for relationships between more distant relatives, such as second cousins, the risk is lower (although still greater than the general population).
Tim Graham Photo Library via Getty Images Prince William and his eldest cousin, Peter Phillips, grew up together. “We had great fun growing up on our holidays, going to stay with [Queen ...
Streep, 74, introduced Longoria as her cousin during the first Zoom table read for "Only Murders," which was attended by more than 100 people involved with the show, including actors Selena Gomez ...
In discussing consanguineal kinship in anthropology, a parallel cousin or ortho-cousin is a cousin from a parent's same-sex sibling, while a cross-cousin is from a parent's opposite-sex sibling. Thus, a parallel cousin is the child of the father's brother (paternal uncle's child) or of the mother's sister (maternal aunt's child), while a cross ...