I really don't know if I can be of any help to you gamommy. Slightly different circumstances, but close enough that I understand.
My brothers were heroin addicts. The emphasis is on the word were. They have since passed on to the "other side of life," both deaths were drug related.
I know you are aware that you can't wish anyone clean. Trust me, I tried. For twenty something years all I ever did was wish for it. When I was a young girl of twelve I would cry and beg them not to stick that needle in their arms.
They were also in and out of rehab, though they never stayed clean.
If you'd like to talk privately, I extend the offer to PM.