This longitudinal study examined the bidirectional associations between parents' sense of competence and children's externalizing problems, mediation of these associations by parenting behaviors, and differences between mothers and fathers concerning these associations. A sample of 551 families with children (49.9% girls; mean age = 7.83 years, SD = 1.08) participated. We found children's externalizing problems to predict parents' sense of competence 6 years later, both directly and, for mothers but not for fathers, indirectly through inept discipline. Parents' sense of competence did not predict children's externalizing problems, either directly or indirectly via parenting behaviors. Some differences were found between mothers and fathers in the associations between parenting behaviors and sense of competence. (Contains 3 tables, 1 figure and 3 footnotes.)