No, you do not get anything on your tax return because your child's father did not pay, If he received a 1st stimulus check it could have been seized for back child support----but only if the IRS has been notified by the agency that enforces child support orders that he is delinquent. You need to contact the local agency that handles child support orders for help. They can arrange for his future income tax refunds to be seized to pay his back child support.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**