I found Frank and Julia Olah with a Baltimore address in my grandma's address book. Frank was my great grandma's twin. Tim, did Frank have any children with Julia or are the children his stepchildren? Would love to know more!
Okay, I have part of the mystery solved. My great grandma's twin, Frank, is not the same Frank that lived in Baltimore. Uncle Frank was born in 1879 and Baltimore Frank was born in 1909. They both lived in Canonsburg, PA and both were married to women named Julia.
The Baltimore Olahs are in my grandma's address book, but I don't know how they are connected to the Olahs in my family. It could be that they were simply good friends but I think it more likely that they were somehow related. My plan is to dig into the Baltimore Olahs' family tree and go back to see what I can find about the family when they lived in PA.