Many critics rightfully claim that the marriage market and an inquiry into its innermost workings are at the heart of Anthony Trollope’s novels, but this Article argues that his novels also depict—on the periphery or sometimes just hiding in plain sight—a set of curiously nonmarital households. These households vary in form, but include widows and widowers living on their own, mothers and daughters living collectively, and male cousins sharing space and the work of daily living. Critics have debated whether Trollope was simply a realistic social historian—chronicling families as he found them— or whether he constructively used literary license to make broader points. On the first reading, Trollope presents a vast ecosystem of family plurali...