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Description: One feature of adolescence is a rise in risk-taking behaviors, which often impact adolescents’ close others (vicarious risk taking). Yet, little is known about how vicarious risk taking develops, particularly depending on the risk’s target and type. In a 3-wave longitudinal fMRI study, 173 adolescents took risks to win money for their best friend and parent. Results of this preregistered study suggest that adolescents took general (propensity to take risks) and adaptive (sensitivity to the expected value during risk taking) risks similarly for their best friend and parent from 6th to 9th grade. VS-vmPFC coupling during adaptive risk taking for best friend changed quadratically. Further, longitudinal whole-brain analyses revealed that posterior insula activity during general risk taking and the intraparietal lobule during adaptive risk taking for best friend versus parent increased linearly. Our findings demonstrate that key neurodevelopmental changes distinguish risk taking for peers and parents over time. Link to Neurovault: https://neurovault.org/collections/13322/