My son is having a very hard time dealing with sharing his toys. He constantly tries to fight his brother if he has a toy he wants. He's only two years old and I already have witnessed him getting very angry. He yells at his brother and tells him to shut up. He will throw things at him, bite or scratch him. His brother is four. I don't know how to get him to calm down and play nicely. When I try to get him settled he lays in the middle of the floor and stops speaking to everyone.

He's a very bright boy! He speaks complete sentences, can count to 20 and knows is alphabets. However, he doesn't like for anyone to bother his stuff. How do I get him to share and play nice? I really need help.