If one partner is already married, any subsequent marriages are not valid until he or she divorces the first spouse;
If one or both parties entered the marriage under a misconception about the other’s true identity, past, or any other concealed fact, the defrauded partner may seek an annulment;
Lack of consent. If either partner entered the marriage through coercion or threat of harm, he or she may seek an annulment;
If one or both partners was under sixteen years old or under eighteen years old without parental permission when the marriage was performed, the marriage may be annulled;
If the partners are biologically related, their marriage is not valid.