I was stuck thinking in terms of famous people, your mention of great-grandfather reminds my how I regret not doing formal recorded/written interview w/ my dad.
This. Think I'd interview my dad. I have only fragments of stories I remember but not the whole story for some. Should probably write down what I know as I am not sure anyone else even knows the stories in general. Nieces and grand nephews might be interested some day. I know the general story of how he got a Bronze Star in WWII, that's even in the unit history. Do not know the rest of other stories. He never told me what happened after they walked into a house near the end of the war and heard German hobnail boots upstairs. He was a medic and not a combat infantry guy so i am guessing it had something to do with drinking and maybe being somewhere they were not supposed to be in one of the divided cities where some were still fighting and some were not.