Get a lawyer, internet forum advice is not enough. If I were you, ask Rich to delete this thread, what if your ex or in laws are reading this thread, do you want them suing you for libel over what you wrote about your ex online? I’m not saying they would win, but anyone can sue and they don’t seem shy about threatening.
Since you are in the 92127 area, here is a lawyer. I know many people who have worked with him, he is reputable.