Abstract Filial maturity refers to the adult offspringâ€™s perception of parents as individuals with past histories and limitations. Three studies were conducted to measure filial maturity and its relational and developmental correlates. Study 1 included adults aged 18â€“59 to empirically assess filial maturity and its correlates across adulthood. Study 2 examined associations between filial maturity and constructs indicative of emerging adulthood (e.g., emotional autonomy), among people aged 18â€“24. Study 3 included young and middle-aged adults (N = 158; ages: 22â€“49) and their parents to assess associations between parentsâ€™ reports of relationship quality and offspringâ€™s filial maturity. Offspring reported greater filial maturity with mothers and with parents with whom they reported greater relationship quality, closeness, and autonomy. Parents who reported greater relationship quality had offspring who reported greater filial maturity. Findings suggest that filial maturity is a dyadic phenomenon that influences parent child relationship quality across the lifespan.