Hello Turtle: I see this is your first post here on PC. So... welcome to PsychCentral! I hope you find the time you spend here to be of benefit.

I'm sorry I don't really have a lot in the way of suggestions for you. What occurs to me is simply that there is a conflict of interest here. I think this sort of problem can occur when two family members see the same professional separately. So my thinking would be that the best thing to do may be to have your stepson see a different doctor. Beyond that, perhaps this is a situation that needs to be addressed in a family counseling type of situation with the help of a skilled therapist. It's a difficult situation.