Which family includes at least one additional relative living in the same household?

The concept of extended families is characterized by the inclusion of additional relatives living in the same household, apart from the nuclear family members. This can include grandparents, aunts, uncles, or cousins, and creates a broader family unit that emphasizes intergenerational support and communal living arrangements.

In contrast, nuclear families consist solely of parents and their children, without additional relatives present. Childless families focus on couples without children, and de facto families refer to partners living together in a committed relationship, whether or not they are married, without the implication of additional relatives residing in the same home. Therefore, the defining feature of extended families is the presence of these additional relatives, which clearly identifies this choice as the correct answer.