Life in the last century or so has become far less conducive to oral history with travel and entertainment. It's much easier to maintain an oral history when live storytelling & music are practically the only form of entertainment and your extended family has lived in the same place for many generations. Still it's not that uncommon even today. I don't know much about my mothers family but I grew up hearing occasional stories and genealogy about the famous ancestor on my fathers side despite the fact that he died over a century ago on another continent. And boy oh boy did we get an education when we went back to visit the old family farm...found out I was related to him at least 2 different ways, as well as half the people on that stretch of road and the hotel owner in town. It seemed like there wasn't a person in town who couldn't tell you their connection to the only really significant person/even in the towns history.