have 8 yr old daughter who is obsessively jealous of her older sister. She cannot do anything without her, unless she is having more fun than her. temper tantrums triggered by the least thing and its always the older sisters fault for her shouting/throwing things etc. The thing is only at home, at school her teacher thinks she is wonderful and so well behaved along with her friend from the next street. Only at home she turns into a devil child when things don't go her way. Tried not to scold bad behaviour and praise when good but not good very often. Tried chart and taking away things, she's only concerned that her sister doesn't get anything more than her. Please help as she is very loving when she wants to be.