Deductions & credits

Lets say donor hasnt had the kids what so ever, pretty much theyve been abandonded for 2 years now. He claimed the 2 boys last year and we think recieved the funds. we then filed a claim against him along side, school files, statements, and birth certificates along with our claim. we have not heard anything and he will probably try to claim the boys again this year.  he had joint custody but then cps took the children away. there was no proper paper work made about custody but the children have been with me ever since, do i just keep trucking and just wait?