nuclear family

Translations
нуклеарная семья
She grew up in a nuclear family with two parents and a sibling.
Она выросла в нуклеарной семье с двумя родителями и братом или сестрой.
Definitions
A nuclear family is a family unit consisting of two parents and their children, living together as a single household, distinct from extended family structures that may include grandparents, aunts, uncles, and other relatives.