I'm in Cambridge (Massachusetts) and my apartment is a 4-bedroom. Building used to be owner-occupied, now converted to two addresses with two apartments in each plus a shared basement with a single-room fifth apartment, price is astoundingly low for the area because the landlord is just the senior who grew up there, I think the other apartments are all 1-2 bedroom or studio. It might be a bit cramped, but you could rent the entire big apartment and fit four to six kids plus two parents.