My ex-wife filled a lawsuit against a school district on behalf of our son who at the time was 12. After about 3 years, the school district settled the lawsuit and put into trust a sum of money for my son. My ex-wife did not involve me in the preceedings, so what I heard was from my son. Of recent, I was at the county building and out of curiosity pulled the file. As it turns out, she too received $10,000 for education and medical expenses, but told no one. As part of our divorce agreement, I pay all medical expenses for my son. In respect to the lawsuit, I paid out of pocket $3000 for my son's doctor and medical expenses. I have all the checks and receipts. She made testimony in this lawsuit that SHE paid these medical expenses. Can I sue her in small claims court to recover the medical expenses?