Previously provided in guidelines*
Family: A family is a group of two or more persons related by birth, marriage, or adoption who live together; all such related persons are considered as members of one family. For instance, if an older married couple, their daughter and her husband and two children, and the older couple's nephew all lived in the same house or apartment; they would all be considered members of a single family.
Unrelated individual: An unrelated individual is a person (other than an inmate of an institution) who is not living with any relatives. An unrelated individual may be the only person living in a house or apartment, or may be living in a house or apartment (or in group quarters such as a rooming house) in which one or more persons also live who are not related to the individual in question by birth, marriage, or adoption. Examples of unrelated individuals residing with others include a lodger, a foster child, a ward, or an employee.
Household: As defined by the Census Bureau for statistical purposes, a household consists of all the persons who occupy a housing unit (house or apartment), whether they are related to each other or not. If a family and an unrelated individual, or two unrelated individuals, are living in the same housing unit, they would constitute two family units (see next definition), but only one household. Some programs, such as the Food Stamp Program and the Low-Income Home Energy Assistance Program, employ administrative variations of the “household” concept in determining income eligibility. A number of other programs use administrative variations of the “family” concept in determining income eligibility. Depending on the precise program definition used, programs using a “family” concept would generally apply the poverty guidelines separately to each family and/or unrelated individual within a household if the household includes more than one family and/or unrelated individual.
Family Unit: “Family unit” is not an official U.S. Census Bureau term, although it has been used in the poverty guidelines Federal Register notice since 1978. As used here, either an unrelated individual or a family (as defined above) constitutes a family unit. In other words, a family unit of size one is an unrelated individual, while a family unit of two/three/etc. is the same as a family of two/ three/etc.
*If the definition of family provided above is used, it must include college students as follows: Students, regardless of their residence, who are supported by their parents or others related by birth, marriage, or adoption are considered to be residing with those who support them.