A household includes the related family members and all the unrelated people, if any, such as lodgers, foster children, wards, or employees who share the housing unit. A person living alone in a housing unit, or a group of unrelated people sharing a housing unit such as partners or roomers, is also counted as a household.
Where did you hear this brother?
https://www.census.gov/programs-surveys/cps/technical-documentation/subject-definitions.html#household
For the census, perhaps. Not for tax purposes.
Thanks for that, it really helps clearing things up!