predict adolescent externalizing behaviors (i.e., alcohol use, drug use, binge drinking, rule breaking behavior, and aggressive behavior). Second, it was hypothesized that family cohesion, adolescent-mother communication, and adolescent-father communication would mediate the relationship between parental problem drinking and adolescent externalizing behaviors. These relationships were expected to be in negative directions. Third, the relationship among parental problem drinking, family functioning, and adolescent externalizing behaviors was hypothesized to vary by adolescent and parent gender. We expected stronger relationships to occur between parental problem drinking and adolescent externalizing behaviors for girls and their mothers, and for boys and their fathers, than in cross-sex adolescent-parent relationships.