A two group randomized design will be used to test the primary hypothesis that the experimental intervention will reduce alcohol consumption and alcohol-related negative consequences significantly more than a comparison family-based psychoeducation condition in both an identified alcohol-using adolescent (12- 18 years old) and his/her teenage sibling (the sibling can be 3 years older or younger than teen with the sibling's age between 12-21 years old). The experimental condition consists of the Family Check-up, while the comparison condition is a less intense parenting psychoeducation program. Time points will include follow-ups at 3, 6, and 12 months.