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WordNet
conjugal family

n. a family consisting of parents and their children and grandparents of a marital partner [syn: nuclear family]

Wikipedia
Conjugal family

A conjugal family is a nuclear family of adult partners and their children (by birth or adoption) where the family relationship is principally focused inward and ties to extended kin are voluntary and based on emotional bonds, rather than strict duties and obligations. The spouses and their children are considered to be of prime importance, and other more distant relatives less important. The marriage bond is important and stressed.