The ten billion dollar question is “how can I reconnect with my alienated child?”
None of this is intended to be medical or legal advice. The site authors hold no (zero) credentials and may have no experience with the methods listed below as a general courtesy.
Otherwise, rest assured, you are in a tough spot and there are no easy answers. In fact, quite likely, no answers at all. But there may be some approaches that might possibly be better than most (but none very good):