Remember that this is a Paradox Game, which means that it can be modded with more freedom than any other game publisher I know of.
They already said that players can "unlock" the city size restriction if they have a capable enough computer, so I would bet that players can also mod households to have more people, IF they can handle it.
They already said that players can "unlock" the city size restriction if they have a capable enough computer, so I would bet that players can also mod households to have more people, IF they can handle it.