The purpose of this study is to test the intervention using a more rigorous randomized controlled trial design in order to demonstrate its efficacy compared to a wait-list control, thus ensuring that change in behavior does not occur due to the passage of time alone. Using this design will also allow us to improve upon our prior clinical research by facilitating obtainment of post-treatment and follow-up data (as families in the clinical-only service stop attending treatment when behavior improves, and have often not followed-up for booster sessions or measure completion).