Hey Anita
Sorry my internet was down.
But ... interestingly! I took some off line time to go thru some old scrapbooks etc. and by reading more carefully my father's notes, I found out my grandfather was a FOR REAL Jackson Hole Wyoming Cowboy in his teens, around 1918 or so for a year or two. How cool is that? I think it's kind of awesome that he's in fact "legendary" :>
Which brings back ... how do I document it? Well, I might be able to identify an old photo, scan it, etc. But my family notes will have to do as "good enough" source data for geni in some ways. I don't think its noted on census reports (I believe he was out of that game by the 1920 US Fed Census -- will have to double check -- and that was a messed up census anyway).
So ... just as in any other "history" issue, people will have to accept the quality of the source data or challenge it.