Previous research suggests that the quality of parents' relationships can influence their children's adjustment, but most studies have focused on the negative effects of marital conflict for children in White middle-class families. The current study focuses on the potential benefits of positive marital quality for children in working-class first generation Mexican American families using observational and self-report data. This study examined the links between positive marital quality and child internalizing and externalizing behaviors 1 year later when the child was in sixth grade (N = 134 families). Positive marital quality was negatively correlated with child internalizing behaviors. Parent acculturative stress was found to mediate the relationship between positive marital quality and child internalizing behaviors in sixth grade.