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All people of European descent have at least one common ancestor in the past 40,000 years. Most of us are inbred several times over. Amerinds descend from a group of about 20 people who left Siberia about 15-20,000 years ago. The exception being the Na Dené groups who come from a similarly small group that crossed about 10.000 years ago. I don't know relative dates for other ethnic groups, because I don't have modern Asian or African ancestors, but as genetic science has proven that we all come from a very small population in Africa that later spread over the globe, ANYONE we have sex with is a relative.
HOWEVER, relations with close relatives is taboo in every society and for a number of good reasons.
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