The basic concepts that you should use when doing the interviews are:

Household is a person or group of persons who occupy the dwelling.

Dwelling is the physical place of inhabitation.

Private dwelling is that which is constructed for one or more persons whether related or not, who live under the same roof, in a family schedule and who regularly share meals.

Collective dwelling is a group of persons who share a dwelling without family rules, for reasons of health, discipline, religion, punishment, etc.