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The nuclear family is the most fundamental social unit fuckwit, its definition does not preclude some extended family living nearby, or even in the household.
1° parents
2° children
powergap
3° extended family
The nuclear family can live with and should interact closely with the rest of the family, you are just confused because you are an amerimutt and you live a retarded american wasp life of estrangement to all members of your family.