'nuclear family' definitions:

Definition of 'nuclear family'

(from WordNet)
noun
A family consisting of parents and their children and grandparents of a marital partner [syn: nuclear family, conjugal family]

Definition of 'nuclear family'

From: GCIDE
  • nuclear family \nuclear family\ n. A family consisting of parents and their children and grandparents of a marital partner. [WordNet 1.5]