Final answer:
Grandparents, uncles, and cousins fit into the category of extended family, which includes a household with at least one parent and child, as well as other relatives.
Step-by-step explanation:
Grandparents, uncles, and cousins fit into the category of extended family. An extended family is defined as a household that includes at least one parent and child, as well as other relatives like grandparents, aunts, uncles, and cousins. This family structure is different from a nuclear family, which consists of two parents and children living in the same household.