Huh? If you live in a condo, you have no house but you are not homeless. A house is only one kind of shelter that can be a home, of many.
Children living with their parents don't own houses, but they aren't homeless either. Or adults for that matter. For a few years in college I lived in a spare room in my grandparent's house. I had no house of my own, but I certainly felt welcome and wasn't homeless by any means.