Given the reciprocal nature of parent-child interaction, involvement of the adolescent in their mother's substance abuse treatment plan might be associated with reductions in adult relapse and improvements in child functioning. These findings would support the assertion that focus on family dynamics in substance abuse treatment programs is an effective use of resources and an important target of intervention efforts. One hundred eighty-three substance abusing mothers and their child (n=61 assigned to each condition) will receive treatment as usual (TAU) and be randomly assigned to 1) Ecologically-based family therapy (EBFT) conducted in the home or 2) Ecologically-based family therapy conducted at the treatment center, or 3) an attention control, Women's Health Education (WHE). In order to examine the endurance of treatment effects, this project will assess the parent and child at 3, 6, 12, and 18 months post-baseline.