That’s very interesting. It’s always good to be related to a centenarian, especially a semi-centenarian, but even more so when this person (presumably) lived so long ago.
I know you said you don’t know when he was born or when he died, but do you have any sort of idea approximately when he died? For example you might know he died roughly so many years before your birth or when your grandfather was a certain age.
If you have any idea, I would very much appreciate if you could say.