A household is all the persons living in a single house or apartment, the family members plus any servants or boarders living with them.
For all practical purposes, the size of an average household in a nation is the same as the size of the average family. In the United States, the average household consists of 3.1 persons.
That’s a small average by world standards, but not the smallest, Sweden and East Germany both have an average household of just 2.6 persons.
Colombia has the largest average household of any nation in the Western Hemisphere, 5.9 persons. But the African nation of The Gambia has the largest average household of any country on earth, 8.3 persons!