Which family structure consists of multiple family members living under one roof?

The correct answer is extended families. This family structure typically includes various relatives beyond the immediate family, such as grandparents, aunts, uncles, and cousins, all residing together in one household. Extended families can provide a support system and share responsibilities, which can be especially beneficial in childcare and education settings.

In contrast, nuclear families consist of two parents and their children living independently, representing a more compact family unit. Single-parent families involve one parent raising children, which may lack the broad network of support found in extended families. Foster families are specifically structured to provide temporary care for children who cannot live with their biological parents, and while they can include multiple members, they do not represent the permanent household connection that defines extended families. Therefore, extended families embody the concept of multiple family members cohabitating under one roof.