The state of Arizona has some strange marriage laws, including interesting laws regarding marriages between first cousins. According to the National Conference of State Legislatures, marriage between first cousins is allowed in the Grand Canyon state as long as both spouses are age 65 or older or are unable to reproduce.
The state of Arizona, does however, prohibit marriages between parents and children, grandparents and grandchildren, brothers and sisters, half sisters and half brothers, aunts and nephews, and uncles and nieces. Like most other U.S states, Arizona does allow for marriage between half cousins or marriage between second cousins.

