It will be really helpful when he gets his own T. Some of the things that I have learned about kids is 1) don't make anything into a battle because this increases their resistence. I would approach him as "this is a problem, what are we going to do about it". 2) Of course they need consequences but it helps if the consequences are free of emotions. 3) Everyone, including kids do things for reasons. Uncovering the reasons is the easiest way to solve the issue. 4) Many kids are angry and this is what is causing the issues.