Final answer:
Extended families are households with multiple generations and additional relatives like aunts, uncles, and cousins, functioning as a cohesive family unit.
Step-by-step explanation:
Families with multiple generations and other kin, such as siblings, aunts, uncles, and cousins living together in the same household, are referred to as extended families. This family structure may involve two or more generations that function as a single integrated family unit. Extended families may consist of polygamous families, married siblings living together, and a variety of kinship ties including both consanguineal (blood relatives) and affinal (marital) ties. The economic and social support provided within an extended family structure can be significant, making it a prevalent form of family worldwide, especially in agricultural societies where labor is a valued resource. Increasingly, these types of families are also seen during times of transition in more industrialized societies, such as the United States.