My sister was divorced from her 2nd husband in Oklahoma, went to Texas and registered to be married in Tarrant county to her 3rd husband. They were married before the legal length of time between divorce and marriage had taken place. Plus, they never mailed in their marriage license after they wed. They were only together for 57 days. Are they legally married? If no, is there anything they have to do? If yes, can their marriage be annuled? Do they have to formally divorce?