extended family

noun
1.
a kinship group consisting of a family nucleus and various relatives, as grandparents, usually living in one household and functioning as a larger unit. Compare nuclear family.
2.
(loosely) one's family conceived of as including aunts, uncles, cousins, in-laws, and sometimes close friends and colleagues.

Origin:
1940–45

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
extended family
 
n
sociol, anthropol a social unit that contains the nuclear family together with blood relatives, often spanning three or more generations

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Cultural Dictionary

extended family definition


A type of family in which relatives in addition to parents and children (such as grandparents, aunts, uncles, and cousins) live in a single household. A nuclear family forms the core of an extended family.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

extended family

an expansion of the nuclear family (parents and dependent children), usually built around a unilineal descent group (i.e., a group in which descent through either the female or the male line is emphasized). The extended family system often, but not exclusively, occurs in regions in which economic conditions make it difficult for the nuclear family to achieve self-sufficiency. Cooperation being necessary, aid is recruited, usually either from the patrilineal kin or the matrilineal kin. In traditional China, for example, the extended family ideally consisted of the nuclear family of the head of the household, his unmarried daughters, his sons and their families, his sons' sons' families and unmarried daughters, and so forth. The extended family may include more distant kin, but the uncles, aunts, or cousins usually belong to the same clan as members of the core lineage.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Your parents and their experience loom large in your poetry-as do your
  grandparents, your extended family.
The extended family was small and they had few relatives to help them.
Younger families want high-quality care for their elderly parents as the
  extended family breaks down.
They tell me their extended family has been knit together because they are all
  networked.
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