A bit of cut and paste for you:
In the United States, every state and the District of Columbia have some form of codified incest prohibition.
However, individual statutes vary widely. Rhode Island repealed its criminal incest statute in 1989, Ohio only targets parental figures, and New Jersey does not apply any penalties when both parties are over the age of 18. Yet Massachusetts issues a penalty of up to 20 years' imprisonment for those engaging in "sexual activities" with relatives closer than first cousins, and Hawaii up to 5 years in jail for "sexual penetration" with certain blood relatives and even in-laws.
Georgia incest laws forbid intercourse between parents and children (including step), brothers and sisters (including half), and grandparents and grandchildren.
