True Left

Yes. Under the extended family model, one house is sufficient for the entire family cycling through generations. Under the nuclear family model, on the other hand, offspring are required to leave after reaching legal adulthood, which means they would need new houses. And whereas expecting to live in the same house generation after generation discourages an excessive number of offspring per generation (or else they would run out of space), expecting offspring to find somewhere new to live removes this discouragement. Thus the nuclear family model is a model designed to generate economic and even populational expansion.