Samantha,
They are my grand parents too. My Uncle Robert Elfner still lives in Manitowoc. He should be in the phone book. Also I have an aunt Dorothy Elfner there too. She had a son Tom and daughter Julie. Tom is deceased. Julie lives in Milwaukee.
My wife, daugther and I live in New Jersey. We come out to Manitowoc, Milwaukee and Green Bay to visit relatives each year.
I am the son of George & Evelyn Elfner who lived in Milwaukee, but are both deceased.