What is Household?

Legal Definition
A household consists of one or more people who live in the same dwelling and also share at meals or living accommodation, and may consist of a single family or some other grouping of people. A single dwelling will be considered to contain multiple households if either meals or living space are not shared. The household is the basic unit of analysis in many social, microeconomic and government models, and is important to the fields of economics and inheritance. Household models include the family, varieties of blended families, share housing, group homes, boarding houses, houses in multiple occupation (UK), and a single room occupancy (US). In feudal times, the royal Household and medieval households of the wealthy would also have included servants and other retainers.
-- Wikipedia
Legal Definition
A family living together. May v. Smith, 48 Ala. 488; Woodward v. Murray, 18 Johns. (N. Y.) 402; Arthur v. Morgan, 112 U. S. 495, 5 Sup. Ct. 241, 28 L. Ed. 825. Those who dwell under the same roof and compose a family. Webster. A man's family living together constitutes his household, though he may have gone to another state. Belonging to the house and family; domestic. Webster.
See also
-- Black's Law Dictionary
Legal Definition
A home. See 60 Pa. 220, 100 Am. Dec. 562. A family, living together. See 112 U. S. 495, 28 L. Ed. 825, 5 Sup. Ct. Rep. 241.
-- Ballentine's Law Dictionary