Family-based treatments for adolescent substance abuse demonstrate efficacy and are becoming a treatment of choice. Family risk factors for substance abuse may present barriers to or suggest targets for modification during treatment. The sample included 149 adolescents presenting for substance abuse treatment and their parents. Structural equation modeling tested the hypothesis that parent psychological problems, parent substance use, and parenting behaviors influence adolescent psychological problems and substance use. This study is among the first to examine the unique impact of maternal and paternal variables on adolescent problems within one analytical model. Results indicated that parental psychological problems were directly associated with adolescent psychological problems after controlling for parent substance use and parenting behaviors. Paternal positive involvement and poor monitoring were also independently associated with adolescent substance use. Results suggest that both mothers' and fathers' symptoms of psychopathology play an important role in the symptoms of adolescents in treatment for substance abuse. Findings highlight the need for family-based assessment in adolescent treatment populations to address important clinical and research questions.