I come from a family of addicts of various types.

The one best piece of advice I can give is that the only person's behaviour you can change is your own. That doesn't just mean what you physically do or say but also how you think and emotionally react to the things that happen to you and around you. This makes me fall into the tough love category I guess. I believe that by changing myself I can affect a shift in the family dynamic that encourages those around me to change for the better.

Good luck to you and your family.