I have an 8 year old son who is starting to be disruptive at home. He is the baby of 5 children. He is being very disruptive and is not listening, he says mean things to his and is physically fighting with his 11 year old brother. When he speaks to me or his father he acts like he is 2 years old. We can't speak to anyone else with out him getting in the middle of us and rudely interrupts until he drags us away from them . He is well behaved at school and other people when we're not around. I am not sure what to do for him. He always gets positive attention from us all. Why he is behaving like this I do not know. I'm desperately needing advice, can someone please help?