This conceptual paper introduces key elements of residential multi-locality studies, arguing that a relational and processual analysis helps understand the interplay of mobilities and stabilities and of presences and absences which are typical of the practices of multi-local living. Based on this perspective, research on familial forms of living and on second homes is re-interpreted. It is discussed how these research fields may contribute to progress in residential multi-locality studies and, on the other hand, which of their aspects would be better highlighted through the conceptual lens of multi-locality. The epistemological added value of this perspective is seen in the sensitivity towards the emergence of new forms of living and towards the ways their stability is achieved in spite of distance. This provides deeper insight into the geographies of families in mobile societies and enables a more profound assessment of the significance of residential economies.