I have primary custody and unfortunatly part of the court agreement made by the mediator was to allow my ex to claim one of our sons on her 2012 tax return. We came to a verbal agreement that I would claim him so that I could get my child care credit back since I spent over two thousand dollars in child care this past year. She only has him roughly every other weekend and doesnt work or finacially contribute at all. The verbal agreement was that I would give her $500 since she stated she would only get back around a thousand dollars if she claimed him she said to put half toward his nursery school. Now that I have filed and recieved my refund she is claiming she would have gotten two thousand dollars and says if i dont pay her 1500 that she will file her taxes and claim him causing the IRS to audit me and claim I went against the agreement and claimed my son. I refuse to give her that much money to blow on cigeretts ect. We have this verbal agreement and I have text messages claiming the thousand dollars she originally said she would get as a refund. I have also looked up alot about non custodial parents and claiming a depend and seems like she wouldnt get back alot of money anyways expecially since she maybe made a thousand dollars total last year due to never working. For all I know she had the least amount taken out for taxes and actually will end up owing money. I dont want to get audited or be forced to pay her money. What are my options here? I am filing for a review of our court agreement to try to get full custody and definatly make it so she cant claim ethier child since she doesnt financially contribute. Any advice please?!