My son relapsed 1 week after a $30,000 stint in rehab -- one of the best in the country. Part of that, of course, is because he did not choose to go there, he was given the choice of rehab or homelessness. Rehab is great but its not a magical place.
Not one of us here have "given up" on our addicted loved ones. We just don't help to dig their graves anymore by enabling them. It's the hardest thing I've ever done in my life but it is working. I credit SR for getting me through it with my sanity intact.
You may have bigger problems than you realize and you are going to need support. SR is a wonderful place for that....even if you often don't like what you hear.
I pray that things work out for your family just the way you hope they will. I really do.