family's definition
Learner's definition of FAMILY. 1. a : a group of people who are related to each other. â This sense of family can refer to a group that consists of parents and their children or it can refer to a bigger group of related people including grandparents, aunts, uncles, cousins, etc. It is often used specifically of a group of related people who live together in one house. [count]
Family, as defined by the U.S. Census Bureau: A family includes a householder and one or more people living in the same household who are related to the householder by birth, marriage, or adoption. All people in a household who are related to the householder are regarded as members of his or her family.