We examined longitudinal direct associations between mothers' and fathers' emotion socialization behaviors (ESB) at 18 and 24 months and toddlers' social competence (SC) at 24 and 30 months in a sample of ethnically diverse families (n = 128) participating in a parenting intervention study. We also investigated interaction effects between mothers' and fathers' ESBs and between each parent's ESBs and child emotionality. We coded parents' ESBs to their toddlers' positive and negative emotions during no-toy play and a clean-up task. Mothers reported on their toddlers' social competence and emotionality. Using multiple linear regression modeling, we report three findings. First, mothers' and fathers' most frequent ESBs were emotion coaching and ignoring to positive and negative emotions, respectively, but emotion coaching of positive emotions by either parent was not associated with children's SC. Second, mothers' and fathers' ESBs to negative emotions, however, were associated with children's SC, but these associations varied by child emotionality and the other parent's ESBs. Third, fathers' non-supportive ESBs to negative emotions at 18 months were directly and positively associated with greater SC at 30 months, but their emotion coaching was significantly and positively related to children's SC only when mothers did not provide any emotion coaching. The association between mothers' non-supportive ESBs to negative emotions at 24 months and 30-month SC was negative only for children high in emotionality. These findings show that both mothers' and fathers' ESBs shape their children's social competence in different ways, which needs to be considered when developing programs for children.