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Same question but, What if the custodial parent is illegal and receives welfsre, and child support and the child support judge told her that she couldn't claim my son on taxes and if she did it again she would get fraud charges put on her? The judge told me that I have my son 50% of the time plus the support I pay make it where I handle over 75% and that my ex couldn't legally file taxes and she needed to stop allow others to use his social security number. How can I go after her?