25 CFR § 700.69 - Head of household.
(a) Household. A household is:
(1) A group of two or more persons living together at a specific location who form a unit of permanent and domestic character.
(2) A single person who at the time his/her residence on land partitioned to the Tribe of which he/she is not a member actually maintained and supported him/herself or was legally married and is now legally divorced.