From Longman Dictionary of Contemporary Englishextended familyexˌtended ˈfamily noun [countable] SSFa family group that consists not only of parents and children but also of grandparents, aunts etc → nuclear family
Examples from the Corpus
extended family• Different cultures have different attitudes to such obligations; for some it is merely an extension of an already extended family.• Everybody here is like an extended family.• Pretty and earthy, she can be aggressive or retreat believably, and has some nice scenes with her extended family.• Well, those of his extended family that he's on speaking terms with at any given time.• Fifi and Manuel steal off for some private time from the watchful eyes of the extended family.• And we can no longer rely on the extended family being dose at hand.• One good thing is that the extended family of toothless hillbillies who used to live down the street moved away. 