This 4-wave study among 309 Dutch adolescents and their parents examined changes in adolescent disclosure, parental solicitation, and parental control and their links with the development of delinquent activities. Annually, adolescents and both parents reported on adolescent disclosure, parental solicitation, and parental control, and adolescents reported on delinquent activities and parental support. Latent growth curve analyses revealed a linear decline in parental control between ages 13 and 16. Adolescent disclosure decreased gradually in adolescent reports and showed an L-shaped pattern in father reports and a V-shaped pattern in mother reports. A stronger increase in delinquent activities was related to a stronger decrease in disclosure in mother and adolescent reports and to lower levels of disclosure in father reports. The linkages between levels of disclosure and delinquent activities were stronger in families with high parental support than in families with lower support. Furthermore, in lower parental support families, a stronger decrease in paternal control was related to a stronger increase in delinquent activities. In high parental support families, however, a stronger decrease in adolescent-reported parental control was related to a less strong increase in delinquent activities.