My friend is totally at a loss at how to deal with her eight year old ds behaviour. He is always sullen and very rude to her. He calls her names and hits her. Totally defiant all the time. He has done a wee on the floor of her living room. He is rude to other adults when she is not there - answers them back, never says please and thankyou, demands things from them. He is extremely immature. I have no idea why he is this way. Mum is lovely but i think dad is very strict. I can't stop worrying about them but don't know how i can help.