You are missing two sibblings: Grace b. 1993 and Florence b.1894. Gertrude was my Grandmother. George married Mary Sittler 1892. I have contacts who have traced the Sittler family back to 1674 Germany. Mary Sittler's parents were Alexander Sittler and Martha Tolson. The Tolson family owns most of Kent Island, MD.
I know this is an old post so not sure if you have found the info. you need.