Multiple theories suggest that the early parent-child relationship plays an important role in development. Past research has shown linkages between parenting style and aggression as well as between language and aggression. Emerging evidence suggests that attachment security is an important predictor of language development. It was hypothesized that there would be an effect of parent-child relationship quality at 36 months on aggression at school entry via language ability at 54 months. To test this hypothesis, path analysis in M-Plus was used. Data for this study were collected as a part of the NICHD, Study of Early Child Care and Youth Development (N = 1,364). Mediation was tested with bootstrapped estimates of indirect effects. The results did not support the hypothesized m