Answer :
The number of people other than my parent(s) living in our primary household during the majority of my life from birth to age eighteen was three.
We lived in a nuclear household: These households have three or more people. There is a household head, spouse of head, and child of head. There can also be multiple children. These households necessarily have a household head, their spouse, and children.
This was the standard number our primary household could carry and sustain. It was easier to feed, educate and clothe. This type of household is very popular
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