A big obstacle to having extended families under one roof is that often the children don't want to live where the parents' home is located. I am certain I could

A big obstacle to having extended families under one roof is that often the children don't want to live where the parents' home is located. I am certain I could move in with my mom tomorrow if I wanted--but it would mean leaving a city I've come to love and the career I've built here to live in a small town with little culture and zero opportunities. I think this is what you see in many rural American towns where only a small elderly population remains, while the young people all moved to cities for economic opportunity.