Is there some further requirement that the family reside in it as their primary residence for a specific amount of time? What is considered "local"? What if l

Is there some further requirement that the family reside in it as their primary residence for a specific amount of time? What is considered "local"? What if local families are already affluent? What qualifies as a "family", do they need to be married? Who is actually permitted to live with the family? This idea falls apart very quickly after the first few sentences of followup.