Please help. My son is 3 years old and will be 4 in three weeks. His behavior is getting out of hand. He doesn't behave like this anywhere else but home. He has three older sisters and he hits them and screams at them constantly. He gets mad if they even turn their head a certain way when he doesn't want them too. We have tried setting him in his room but we have to put his car seat in there if not he will destroy his blinds and stuff in his room. He can also be the sweetest thing in the world. But it's ruining our home life and I need help. My girls never acted this way and my husband and I are at a loss.