I feel for you too. It makes me sad when people don't consider the effect their actions have on their children... or any children for that matter. The letter idea might be a good one. It's a good way to get out everything you want to say without the other person having the opportunity to fight you about it. A laywer might be handy too, but I don't know much about law. Anyways good luck with it all and hang in there, it's hard but you'll find the strength to get though it.