I don't know if your still looking for info or your grandfather, but I just found out that I am a cousin to your great grandmother Elsie Marie Robertson. Her parents were
(Ira Robertson 1874-1955 and Annie Delilah Cronk 1875-1923 Both of Fairfax County Va.). The Cronks are direct relations of my grandmother. I Have a ton more info if you need it. joetheatreart@aol.com