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85, all living under one roof. >> good night, elizabeth. >> good night, john boy. good night, jim bob. >> reporter: this kind of living arrangement used to be common in america. the great depression forced families to live together. remember "the waltons"? >> somebody left her on my doorstep. >> is that where you found the rest of us? >> where are we going to put this? probably on our -- >> reporter: today tough times mean more than 51 million americans are living in homes with more than two gen...