Solidarity is a key virtue in Christian family ethics. Emphasizing the institutional and practical dimensions of this principle, this essay claims that inter- and intrafamily solidarity are critical aspects of a Christian family ethics emanating from Latina/o theological anthropology and family practices. Interfamily solidarity, exemplified by the Latina/o family practice of extended communal family, emphasizes the integral dynamic between family solidarity and the common good. Intrafamily solidarity simultaneously critiques abusive dynamics in Latina/o families while asserting the necessary dialectic between individual and familial flourishing. This articulation of family solidarity asserts a robust role for extended communal families in fostering cooperation across difference in civic life.