Positive peer and romantic relationships are crucial for adolescents' positive adjustment and relationships with parents lay the foundation for these relationships. This longitudinal meta-analysis examined how supportive and negative parent-adolescent relationships continue into later peer and romantic relationships. Multilevel meta-regressions based on 81 longitudinal studies (559 effect sizes, including 49,769 participants) indicated that supportive and negative parent-adolescent

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... were associated with supportive and negative future peer and romantic relationships. Meta-analytic structural equation modeling based on 48 studies (48 effect sizes, including 14,969 participants) indicated that supportive parent-adolescent relationships unidirectionally predicted supportive and negative future peer relationships, while negative parent-adolescent relationships were bidirectionally associated with supportive and negative peer relationships. Our findings highlight the importance of relationships with parents beyond childhood.