My 4 yr old son talks a lot of aggressive and violent things like I will hit you or i will throw you and many other harsh and more severe things. We have tried explaining to him that it is not good to speak such things, he says sorry each time and then again repeats the same thing. It is more like some hidden anger is coming out.At home we do not use bad or harsh things. Not sure from where he has picked this up. With outsiders he is a good kid. And does not show any aggression. But we are worried since he continously talks of violent things. Please help