Answer:
A couple and their children living together in one household
Step-by-step explanation:
Among family members, it is possible to identify two degrees of proximity: the nuclear family and the extended family. The nuclear family is usually composed of parents and children living in the same house, while the extended family is composed of grandparents, uncles, cousins, etc.
However, this concept is flexible, as grandparents (or other relatives) can often live in the same house and are therefore considered to be a nuclear family. In other cases, one or both parents may not be present for some reason and are not part of the nuclear family.