- Participants will have a teenage sibling within 3 years of age of the identified adolescent patient. Siblings can be either biological or unrelated siblings in blended families, as long as they live in the same home as the parents targeted in the intervention conditions. The adolescent must have experienced a recent (within 1 month) alcohol-related event (ED admission, school disciplinary action, grounding by parents, legal action). The adolescent must also screen in by reaching the clinical cutoff score on the Adolescent Drinking Index.