Laws prohibiting marriage in the 50 states, the District of Columbia, and two territories have been classified as those inclusive for categories of lineal and collateral relatives, and those specific for lineal, collateral, and affinous relatives. A person may not marry a parent, grandparent, child, or grandchild except in Georgia, where a man is not prohibited from marrying his daughter or grandmother. While all political units prohibit marriage between a person and a sibling, an aunt, or an uncle, their prohibitions vary considerably for other degrees of collateral relationship. The uncle-niece marriage is not prohibited in Georgia and among Jews in Rhode Island. Generally, marriage between persons with a coefficient of relatedness equivalent to first cousins or closer has been prohibited. Fewer than one half of the political divisions have prohibitions regarding affinous relatives.