Q) Can i get money back from paying child support and married living together.
A) Generally, if you have been ordered by a court to pay child support, you cannot get that money back, even if you are now living with the other parent of the child. Child support is intended to provide for the needs of the child, regardless of the living arrangements of the parents. However, you may be able to modify the child support order if your circumstances have changed, such as a decrease in income or a change in custody arrangements. You should contact your state’s child support agency or an attorney to discuss your specific situation and options for modifying the child support order.
Again, unfortunately the answer to that question, is no. In fact, under the laws of most states, even if you find out the child you’ve been supporting is not your biological child, you will still be on the hook for child support until the child reaches 18. https://www.legalzoom.com/articles/can-you-get-a-refund-if-the-child-you-support-isnt-really-yours