Longitudinal data from NICHD Study of Early Child Care and Youth Development tested direct, indirect and reciprocal effects of maternal depressive symptoms, stress/support factors on child bullying and peer victimization through mother–child relationship quality at grades 3, 5, 6. Data from 828 mother-child dyads indicated small significant effects of some hypothesized pathways, including a small direct effect of maternal depressive symptoms at grade 3 on peer victimization at grade 5, but not on bullying behaviors. Mother–child relationship quality at grade 5 negatively predicted bullying at grade 6, but not peer victimization. There were small effects of bullying behaviors at grade 5 on decreased mother–child relationship quality at grade 6. Maternal employment at grade 3 predicted decreased bullying behaviors at grade 6 through mother–child relationship quality at grade 5. Findings are relevant for parent inclusive research and approaches to anti-bully intervention strategies and prevention policies.