Okay, so my ex hasn't seen our son, A, since I moved home three years ago. I informed my ex in via email before we moved which satisfied the state's requirements regarding moves out of state. During those three years the ex has not initiated any contact with us, I've always had to call him. Well, last fall I made plans to take A to see his dad for Christmas, but mid November his dad started dating someone new and said we couldn't visit. A week later he changed his mind and said that we could visit but only if his new girlfriend was allowed to play mommy to A. I said I would not allow her to meet A yet because he had only started dating her a week before. He then proceeded to call me a slut and call A a retard and he hung up on me. We didn't speak until February of this year when I called to inform him that A had a seizure. He then told me that A hadn't had a seizure because his girlfriend knows a doctor and she said there was no seizure. Well, the other day the ex emailed asking if his name was on A's birth certificate, I answered and haven't heard from him since. I'm worried that he might plan to file for custody as he has threatened to do so in the past to spite me. He doesn't care about A and A is terrified of him. I don't want him to have custody or even visitation because A is autistic, epileptic, and diabetic and his father has made it clear that he doesn't believe A has any of these conditions and wouldn't give A the medicine he needs to survive. Am I being paranoid here? Is there some other reason he might need A's birth certificate?