from the report: This report uses the characteristics of the householder to describe the household. The householder is the person (or one of the people) in who

from the report: This report uses the characteristics of the householder to describe the household. The householder is the person (or one of the people) in whose name the home is owned or rented and the person to whom the relationship of other household members is recorded. If a married couple owns the home jointly, either spouse may be listed as the householder. Since only one person in each household is designated as the householder, the number of householders is equal to the number of households. The count of households in this report excludes group quarters. Further definitions are held here: https://www2.census.gov/programs-surveys/cps/techdocs/cpsmar20.pdf https://www2.census.gov/programs-surveys/cps/techdocs/cpsmar... (dont have time to parse through, but I suspect that there is only one head of household, and thus it means a child who is 18+ living with their parents, they are basically aren't even considered in the calculation)