| http://www.w3.org/ns/prov#value | - All US states prohibit marriage between ancestors and descendants, such as grandparents and grandchildren, aunts/uncles and nieces/nephews, or parents and children. 20 states currently allow first cousins to get married. 6 additional states will allow first cousins to marry under certain circumstances (e.g., above a certain age or unable to reproduce).[6]
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