Definition of extended family
: a family that includes in one household near relatives (such as grandparents, aunts, or uncles) in addition to a nuclear family
Given space, there are ways in which even larger populations than the extended family can be accommodated under one roof.— Paul Oliver
also
: an extensive group of people who are related by blood or marriage or who otherwise regard themselves as a large family
Four out of every five people who go through a first divorce remarry … . Thus it is that husbands and wives, their former partners, children and stepchildren, and a whole constellation of grandparents and other relatives are brought together in the new American extended family. — Michael Norman During his five years at Owen High, he turned his teams into an extended family and tried to instill in his players the same sense of self-worth that Baldwin had imparted to him years before. — William Nack
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Merriam-Webster unabridged
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Time Traveler for extended family
The first known use of extended family was circa 1935
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