To explore the link between interparental hostility and adolescent problem behaviors, the current study examines four important maternal parenting dimensions as potential mediators: acceptance, harshness, inconsistency, and psychological intrusiveness. With a primary sample of 1,893 sixth-grade students, the measures included adolescent and teacher reports. Structural equation modeling revealed that each parenting construct partially mediated both internalizing and externalizing adolescent problems. Harshness was the strongest mediator for adolescent externalizing. Psychological intrusiveness and low maternal acceptance were the strongest mediators for adolescent internalizing. Inconsistency linked similarly to both internalizing and externalizing. Stronger linkages were found in families with married parents compared to those with divorced parents, but overall the patterns were similar. Youth gender and ethnic differences in the spillover processes were minimal. The findings provide a process model for understanding interparental conflict and adolescent problems. (Contains 2 tables and 1 figure.)