My puppy wont quit biting my son whos 4 and of course want to play with the puppy?

hes a ten week old husky/gsd he and my son play all day long. But Ares likes to bite or mouth. and my son doesnt help cause he will go back to it after i yell at the dog. Any tips or suggestions without isolating him from my son? I want them to play and have fun but Ares will bite anything, hands,arms,legs,pants whatever he can get his mouth on. Or am I expecting to much to soon?