The Family Check-Up is a selective intervention program that focuses on parents. Its goal is to provide individualized feedback to motivate parents to make improvements in their parenting practices. A unique strength of the FCU is that feedback is individualized and tailored to specific parenting skills as they typically pertain to an identified adolescent in the family. We propose to evaluate the efficacy of the FCU when applied to both an adolescent identified patient (IP) and a sibling close in age. Our rationale for including a sibling close in age derives from a strong empirical base which has shown that: 1) sibling resemblance for alcohol use is high and environmental factors shared by siblings account for substantial portions of variance in adolescent alcohol use; and 2) specific interactional dynamics of the sibling relationship (collusion) are related to teen alcohol use. Dr. Dishion has found that in high-risk families, sibling collusion accounts for variance in problem behavior after controlling for involvement with deviant peers. This connection between ineffective parenting strategies and sibling relationship dynamics in combination creates increased risk for alcohol use by siblings close in age. This notion serves as a foundation to examine the efficacy of a sibling-enhanced FCU intervention with respect to: 1) improvement in parental communication and monitoring; 2) reduction of sibling interactive behaviors that are associated with alcohol use; and 3) reduction of alcohol use in IP adolescents as well as siblings who are currently using alcohol. We will test specified mediators of FCU efficacy in reducing levels of alcohol use at both the parenting level and at the level of sibling dynamics. In order to determine whether other types of family-based interventions might be just as helpful as the more intensive FCU, efficacy of the sibling-enhanced FCU will be compared to a parenting psychoeducational program.