Hey guys... I'm typing this through tears so please bear with me.
First, thank you from the heart for taking the time to offer support and advice. It helps a lot.
Just a couple small things:
He's been in therapy- individual, family, group -- a number of times. He's been on anti-depressants--several different kinds. He refused to go along with any of it back when we started, and we tried again & again. He still refuses.
I have realized that it is not ironic at all that a therapist (me) would have a child like this. I'm just like anyone else and I have to keep reminding myself that I should be taking the advice that I would give a client, to give him some opportunities to shape up--he's had more than I can count---or tell him to leave--that's the only option here.
This is not going to be easy--beyond the emotionality of it is the fact that we co-signed on his car and we know that he won't make payments--he's always behind even now--so it's inevitable that this is going to cost us, but it can't be a reason to let him stay.
After getting some groceries, my husband is going down to the police station to file a report. I just hope they don't cop out with the * he's a family member, so the car can't be stolen,* response. Regardless, for insurance reasons, we'll have our bases covered.
I'll stay home in case he shows up--meanwhile I can do one of the things that helps me when I'm stressed--put some upbeat music on and clean house

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Thank you again for for taking the time to express your thoughts on this.
Cyn, your idea for a poll is excellent. I tried to edit the post to add a poll, but it seems it's not an option now that I've posted.