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This article is situated within existing research linking social and spatial mobilities, by questioning the mechanisms and representations associated with the residential and migration trajectories of young people from Reunion. It pays particular attention to the family as a site for the co-production of these trajectories, bringing into play logics of class, gender, and birth order. Crossing the Migrations, Family and Ageing survey (conducted by INED in 2010) with a corpus of 18 interviews, it traces the trajectories of six upper-middle-class young people, situating them within their family biographies and also within the space of Reunionese youth. It shows how the choices to leave or stay are part of collective decision-making processes that are strongly rooted in the family space and also embedded in a renegotiation of family roles, which is an aspect of the path of the transition to adulthood.