I am not related to your family. But, I would like to try to help...if I can.
You said your great grand mother died in the 60`s. I found two Anna Pfau death dates. Anna M. Pfau: b: abt. 1878 - d: 13 Mar. 1961 in Defiance County, Ohio Anna M. Pfau: b; abt. 1886 - d: 27 Dec. 1963 in Hamilton County, Ohio
Do you know Anna`s maiden name? Do you know abt. when Charles Pfau was born?