According to fair housing laws, familial status refers primarily to:

Familial status, as defined under the Fair Housing Act, specifically refers to the presence of children in a household. This includes individuals under the age of 18 and relates to families with children, single-parent households, and pregnant women. The law aims to prevent discrimination against families with children when it comes to housing opportunities.

In this context, while marital status, age of guardians, and health conditions may relate to individual situations, they do not directly influence the definition of familial status. Familial status is solely focused on the existence of children in the household, making it the key factor in this area of fair housing legislation.