My sister had emailed me this awhile ago and I wanted to save it but also want to clear out my email:
Just remember to give M positive attention when he is doing appropriate things and make sure to praise this behavior. When he is behaving in a way that you deem as inappropriate either ignore if the situation permits, or immediately apply a negative consequence.
Basic stuff, but it is always nice to have the reminder. My sister's pursuit of a PhD in psychology is obviously working out well . . .