I remember visiting some people many years ago who were having an addition built on to their family home. The woman declared that she couldn't wait for the addition to be finished because they had been living on top of each other for so long. When I was in high school, my family lived in a two bedroom apt for a couple of years. There are six kids in my family. I wondered at the time what they would have thought about that arrangement.
Anyway, for those of you interested in a little comparison, here it is: