You're funny, but this isn't unfortunately. What can you do? I don't know. I'm in a similar boat, with my brother in law, a lifelong drug fiend, who at 40 something discovered the miracle of cocaine. What do I say to my sister? Nothing. Wait for it to explode, hopefully not in her murder from that psychopath, and help pick up the pieces--as in my niece and nephew. I don't know you can do anything but stay clear enough so when they crash you don't get caught up with shrapnel and then you can play medic. Bottom line--it's not your responsibility.