Summarising how economists have historically studied families from the nineteenth century to the present, we recall that economists developed methodologies in response to how they imagined and constituted the problem of family poverty in different periods. In contemporary times, concerns for poverty-alleviation have increasingly featured concerns for justice across gender, race, and ethnicity. We also recall how family economists prioritised some social and political problems over others, leaving significant injustices uncontested. These findings encourage reflection on how we define the social problems of families today. Describing the small body of economics on the relation between family behaviour and a sustainable biosphere, the book closes with a provocation. If each period of family economics has relied on an act of imagination to formulate the family-relevant social problems worthy of consideration, how might we constitute the problem of family poverty today, consistent with justice across gender, race, and ethnicity, while also tackling the very urgent need for a biosphere capable of supporting human life? How might we imagine living well and dying well today, on a damaged planet undergoing ecosystem collapse? And how might economists assist families to tackle this problem, today?