This paper proposes a sociocultural perspective of mobility, of which migration is only one case, with a focus on mobile families. Consistent with mobility studies, sociocultural psychology of the lifecourse proposes to study both the sociocultural conditions of mobility, and the perspective of mobile people. In addition, in this article, we consider interrelated lives in mobility. We discuss the specific case of one family documented as part of a larger research project on repeated geographical mobility, and highlight the specificities of the context, the experiences of each family member, and some of their overlapping spheres of experiences. We thus hope to document the life of such families, but also to provide theoretical directions for the psychological study of mobility. Public Significance Statement This study examines the interrelated lives in families who move frequently internationally for professional reasons. It invites to pay a closer attention to the various members' distinct experiences of repeated mobility, and especially children's specific experiences. It also highlights the role of joint, transportable activities that may support a feeling of continuity and "home" for family members "on the move".