Maybe my initial question was more one for Sociologists , Anthropologists. In contemporary news I have seen people seeking Historic linkages to African ancestors discover when talking in the communities, Certain people had recall about an ancestor of THEIRS being a "Chieftain" or great "Warrior", back well over 200 years lets say 250, and it was substantiated thru completely independent information and evidence. and then thru DNA links that spanned the centuries. their core tribe or families had probably not gone outside of a radius of 200-300 hundred miles, but it was certainly outside original site.
Back to ancestral genealogy, I'm seriously curious if a parent, father lets say, could reasonably tell a verbatim explaintion about his 2GGF when supporting an arranged marriage of his child. in other words the childs 3GGF is the focus of the story. Here are personal data points.
My father heard a narrative about his 3GGF when he was young, and there was very tiny amount of "possible evidence" that he heard saw, But very important he heard the family name. He believed. He repeated it to me and my brother. without evidence but name was mentioned. My brother was a believer, I was skeptic, and a couple other siblings in between or in dark.
Thru the miracles of modern technology, I now know the story is true, facts are clear, and I pass the story to my grandchildren with some evidence handed to them. So in this case the 4GGF to me was explained and the 6GGF to my descendants. as well as my brothers.
without evidence maybe his descendants repeat the story maybe mine dont. That is what I was hinting at about forgetting a particular family honor.