I've read over all the excellent suggestions here. But I'm wondering if you've discussed his behavior with his doctor? It seems well out of the norm for a 10-year-old and I'm wondering if there could be a medical reason?
Well, we will try to discuss with his doctor, if he is available and willing to speak with us (both conditions being hard to obtain simultaneously) ... Moreover, I am always afraid of the French way of psychology thoughts (Freud, the link with the mother, Oedipus complex and other craps)... We'll see.
regarding the behavior, he is out-of-the-norm since he is born ... He is a teenager in rebellion since he is 6
. May be he'll behave like an adult next year
