It is argued that the grandparents wealth, the mother s intelligence, and the father s indifference make the child s ability. Is it really good for your children that fathers are only devoted to their jobs and fathers are indifferent to them? The purpose of this study is to presuppose interdependence between all members and members rather than the relationship of some members of the family and investigate the relationships between the work-family conflict of the father and the family structure and their influence on the child s problem behavior through the role of the father in the socialization of the child. This study analyzed the data of 2016 when the sample children were enrolled in the second year of elementary school in the Korean Children s Panel. This study applied the triad theory of Simmel to capture the dynamic aspects of fathers, mothers, and children in interdependent relationships while approaching the social capital aspect of the family structure for the child s internalization and externalization problem behavior. As a result of the study, first, eight types of family structures were identified based on the strength of ties between family members for parents and children of elementary school students. Second, it was confirmed that the conflict of father’s work-family is related to six types of family structure, where the degree of bond between family members is weak. Third, it was confirmed that the work-family conflict of the father is directly related to the child s problem behavior or indirectly through the family structure with weak ties. Fathers are increasingly becoming important entities within the family structure that can actively influence the development of their children. In this regard, this study raises the need to consider the father s work-family conflict.