Question: My fiancé pays cs for his 8yr old daughter. Her mother never lets domestic relations know she’s working. Should she?? Answer: You will still have to pay back what you owe. However, you could seek to modify retroactively to when she left the kids with you, maybe and depending on all facts, pursuant to CRS 14-10-122(5). More information is needed to fully assess your situation and you should consult with a child support attorney. If she is ordered to pay you child support, you could potentially pay back some of what you owe via that, or her withholding some from that.