Family systems theory which postulates that family-level processes affect children’s development over and above any individual subsystem, has changed the emphasis in research on children and families. Previous research of child devel- opment in families focused on associations with individual parent-child relationships or on connections between the marital relationships and child adjustment. In contrast, researchers have recently articulated distinctive family group dynamic, coparenting, which uniquely predicts children’s social and emotional adaptation, over and above the effects of parenting and marital processes. This article reviews the literature on recent coparenting research and studies linking this family relationship to important indicators of children’s development and adjustment. The implications for clinical practice and directions for future research are discussed