This is exciting. I'm so glad to have heard from you. I'm sure it is the right family. Other than the obit that lists Catherine (Mrs. Joseph Wagner) as the niece of my great aunt, Margaret Fritz Neis, I've found the bio of your grandfather Albert and also of Joseph in the History of Fond du Lac (published 1880)Albert's mother is listed as Catherine Dietrich Wagner. Write to me at firstname.lastname@example.org
and we can share information. I have the Diederich's back to their village in Bavaria.