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Double-first cousins have twice that of first cousins and are as related as half-siblings.Children of these marriages may have an increased risk of genetic disorders, particularly if their parents both carry a harmful recessive mutation.
For example the second cousin once removed relationship is a second-degree cousin with one removal.
If the cousins are removed, the smaller number of generations to the most recent common ancestor is used to determine the degree of the cousin relationship.
For example if one of the cousins has to go back one generation beyond their parents (the grandparents) before finding the most recent common ancestor and the other has to go back one or more they are first cousins.
The percentage of consanguinity between any two individuals decreases fourfold as the most recent common ancestor recedes one generation.
First cousins have four times the consanguinity of second cousins, while first cousins once removed have half that of first cousins.
Note that two people can be removed but be around the same age due to differences in birth dates of parents children and other relevant ancestors.
The degree of the cousin relationship is the number of generations prior to the parents before a most recent common ancestor is found.
Currently about 10% and historically as high as 80% of all marriages are between first or second cousins.
Anthropologists believe it is used as a tool to strengthen the family, conserve its wealth, protect its cultural heritage, and retain the power structure of the family and its place in the community.
A person shares a first cousins twice removed relationship with their grandparents' cousins and their cousins' grandchildren.
At least one set of one person's grandparents are the great-great-grandparents of the other person.
The difference between the number of generations for each cousin is the removal.