Is there a possibility of a sober living home? I have to say, they are looking at him solely which is their job. Of course him having a roof over his head and his parents support is the best for HIM. What about YOU and your sanity? These are just my thoughts.
I am glad you are in therapy although I question, is it with his therapist or is it your own? I suggest you have a therapist that is your own that does not represent him in any way. You may already be doing that, if so I am sorry that I missed it!
Keep posting here, it will help you get support and it will help you to get it off your chest!
Hugs and God Bless!