The purpose of this study is to evaluate the Wonders & Worries psychosocial intervention designed for children ages 5-14 who have a parent diagnosed with early stage cancer. The Wonders & Worries program curriculum is a psychosocial intervention that was designed to address the communication and distress issues raised in prior descriptive research and to respond to the limitations of current research. The goals of the program are to improve children's behavioral-emotional adjustment to their parent's cancer, improve parenting behavior (parenting quality, skills and self-efficacy), and increase family communication about the illness. The aim of the current study is to evaluate the efficacy of the Wonders & Worries program on child and parent outcomes within a randomized clinical trial.