Scholars theorize the effect of modernization on religious and familial institutions in a parallel way. Some argue that both are irreversibly in decline—as secularization and deinstitutionalization, respectively—while others argue that they have either merely changed or are in fact growing stronger. However, correctly interpreting institutional change depends not only on how one evaluates the empirical starts and endpoints but also on how one defines the domains under change themselves. In this paper, I examine these debates, detail the structural similarities in their arguments, and outline a new analytical approach informed by recent work in institutional logics to better answer the definitional questions. Theorizing both institutions together and their parallel trajectories in modernity reveals unique insights about the scholarly discourse on modernization and is especially important given the unique influence of religion and family on one another as (seemingly) privatized spheres of social life.