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Bittles has spent almost 40 years researching consanguinity and has published more than 100 papers on the topic.Bittles thinks that relationships between relatives may be on the rise in America because of immigration.To assess consanguinity, researchers give relationships an inbreeding coefficient — the higher the number, the closer the two individuals are related.First cousins have an inbreeding coefficient of 0.0625. marriages are between people who are second cousins or closer needs to be treated with plenty of caution.Before then, he was “unaware that such marriages occurred in major populations,” he told me.(You, on the other hand, Daryn, told me that you became interested in this question while “browsing around the ancestry of Queen Elizabeth II.” To each his own.) Since then, Bittles has attempted to piece together a map on the global prevalence of consanguinity.In 30 out of the 50 states a person can marry their second or third cousin but not their first cousin.Cousins marrying cousins is prohibited in certain cultures because it is viewed as incestuous whereas other cultures have no qualms about it at all.
Roosevelt married a cousin of his although she was not a first cousin, although she did have the exact same last name as him.
Today people also travel more and have a much broader view of the world because they see more of it.