Originally Posted by
dandylion 
If he wants, he has the right to beat you to punch, and tell them yourself...but, I really doubt that he will do that without you pressuring him to do it....
This is it right here.
I do not want to override his right to talk to my parents about his addiction. They are barely a third party in my mind. We have a very close relationship with them. We just moved out of their house after over half a year of living with them (we were in between selling our house and remodeling the new one). They definitely witnessed some very suspicious activity of his and both of my parents asked me in different ways if things were ok. I was a poker player and revealed nothing because I was in denial and was too proud to admit anything. So they are more involved in this situation than perhaps the average in-laws.