I believe we're related through a common ancestor in Switzerland. Your 13th great-grandfather, Peter Diebendorffer, was born in Bassersdorf at about the same time that my 13th great Grandfather, Peter Dubendorfer, was born in the same place. Bassersdorf is about 3 miles from Dubendorf, which is where the family originated. The variant spellings were common, and they sound almost identical in German. Its very unlikely that they were not related in some way.
I'm working towards getting the entire US Dubendorfer line, with all its variants, on one family tree. Hence my inclusion of your grandmother, Mildred. Feel free to look it over and let me know if I have missed anything on your part of the tree.