What could a US citizen father do if his ex-wife who is an illegal alien from Mexico goes back to her home in Mexico with their American born boys 6 yr old and 3 yr old? Would that be kidnapping if both parents had joint custody? What if she did that before the divorce was final? Could the father call the police and file kidnaping charges against her and if so what would happen? The boys do NOT have dual citizenship and so are not citizens of Mexico.