Data from the Christchurch Health and Development Study, a 30‐year prospective longitudinal study, were used to examine the associations between the quality of parent–child relations in adolescence and adult parenting behaviour 15 years later. At ages 14 and 15 years, cohort members were interviewed about the quality of their relationship with their parents. At age 30, those who had become parents underwent a parenting assessment using self‐report and observational ratings of positive (warmth, sensitivity) and negative parenting (overreactive, inconsistency, and physical punishment/abuse). Results showed that adolescents who reported higher quality parent–child relationships were later characterized by higher levels of parental warmth, sensitivity, and effective child management, and lower levels of overreactive parenting. These associations remained after extensive covariate adjustment. Study findings highlight the importance of close parent–child relations during adolescence in preparing an individual for the challenges of caring for and parenting their own children when they themselves become parents.