In this paper, I contend that a focus on children growing “in” and “between” “two homes” as a result of post-divorce/separation shared physical custody arrangements, provides new avenues for the study of gender socialization within families in heterogeneous environments. I start with a critique of mainstream family and gender sociology’s tendency to conceptualize family socialization as a homogeneous process, and to focus on parents as a ‘unit’ that produces rather homogeneous “family cultures”; and I highlight the contribution of scholarship on ethnically-mixed couples in illuminating the ways in which parents deal with cultural differences and points of disagreement regarding the upbringing of their children. I then move on to focus on post-divorce/separation families practicing shared custody of their children, as a particularly relevant example of the heterogeneity of family socialization processes. In this situation, children who travel back and forth between two ‘homes’, as they alternatively reside with their mother and father, are socialized within, and across heterogeneous family environments with their own specific gendered norms and practices. Building on Raewyn Connell’s theory of gender, I show that each of these ‘homes’ are governed by specific gender regimes, and point towards the importance of understanding how children appropriate and negotiate these gender regimes, how they navigate between them and how they construct their own gender identity in this context. I continue this discussion by examining two major societal transformations that are of particular relevance for the study of gender socialization across households, and that constitute the two key avenues I explore in MobileKids, an ongoing project on children in shared physical custody arrangements: the mobility turn, and the digital revolution . I argue in particular for the importance of connecting gender socialization in shared custody arrangements with the acquisition of mobility capital (Kaufmann & Widmer, 2005, p. 201) and with processes of territorial appropriation; and highlight the role that ICTs play in the everyday lived experiences of shared physical custody and how these technologies intervene in gender socialization processes.