Good news for our southern, err, cousins:

Quote
Risk is in the eye of the beholder, of course. But in 2002 an expert panel convened by the National Society of Genetic Counselors found that the risks of a first-cousin marriage are about 1.7% to 2% above the background risk for congenital defects and 4.4% above background (which is vanishingly low to begin with) for dying in childhood.

Whether 2% and 4% seem like a big extra risk or a piddling one probably depends on how much you want to marry your cousin, but Spencer concludes that “neither the scientific nor social assumptions behind [anti-cousin-marriage laws] stand up to close scrutiny. Women over the age of 40 have a similar risk of having children with birth defects and no one is suggesting they should be prevented from reproducing. People with Huntington’s disease or other autosomal dominant disorders have a 50 per cent risk of transmitting the underlying genes to offspring and they are not barred either.”
Newsweek

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