 The purpose of the study is to test the effectiveness of a child obesity intervention with multiple components targeting nutrition andor psycho-social factors in children, their parents, and their classmates. The specific aims of the study are to 1 Determine the effectiveness of two family-level interventions for improving child outcomes unhealthy eating, low activity, and overweight; 2 Determine the extent to which adding a family dynamics component enhances the effectiveness of a family lifestyle intervention and improves the child outcomes listed above; and 3 Determine the extent to which a peer-level intervention improves the effectiveness of two family-level interventions among overweight children. 