A. Marriage between parents and children, including grandparents and grandchildren of every degree, between brothers and sisters of the one-half as well as the whole blood, and between uncles and nieces, aunts and nephews and between first cousins, is prohibited and void.
B. Notwithstanding subsection A, first cousins may marry if both are sixty-five years of age or older or if one or both first cousins are under sixty-five years of age, upon approval of any superior court judge in the state if proof has been presented to the judge that one of the cousins is unable to reproduce.
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Resource: Arizona State Legislature