My 7 yr. old daugher is the youngest of (2) kids, and her anger at home has a short fuse. Every time our 9 yr. old son engages her (as siblings do), she explodes and starts hitting and screaming at him. Also, when we ask her to do her chores, something she doesn't want to do, or telling her no for something she wants to do, she starts crying and pitching an absolute fit. Of course at school and with others, she is a dream, helpful and the "perfect student". How do we handle these angry outbursts, and for her to become a better contributor to our family?