My 5 year old son is so jealous of his little sister. She was doing something cute tonight so I pointed it out to him. He giggled at it then lent over her and bit her arm really hard and made her cry. He got sent to bed early (it was 6pm). He told me he wants rid of her, doesn't like her and doesn't like his family any more. I told him I look forward to friday night so we can cuddle up and watch TV when she's gone to bed and he's spoilt it. He went on tractor and to cinema with dad last weekend to himself and gets lots of attention. Still doesn't stop him being jealous. Yet at other times he'll tell her he loves her, gives her a kiss and they have fun together. Any tips on reducing the jealousy and nasty behaviour?