Are incestuous marriages void in South Dakota?

Yes.  Under South Dakota law, marriages between parents and children, ancestors and descendants of every degree, and between brothers and sisters of the half as well as the whole blood, and between uncles and nieces, or aunts and nephews, and between cousins of the half as well as of the whole blood, are null and void from the beginning, whether the relationship is legitimate or illegitimate.

Brooke Swier Schloss
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Family Law and Estate Planning attorney helping families across South Dakota plan and protect their loved ones