"... walter's father is Peter Klaas. I know my grandfather was born in Millwaukee, Wisconsin ..."
Have you collected more Klaas research since your 2004 posting?
There are clippings in Milwaukee's German language newspapers for a wedding anniversary of a Mr & Mrs. Peter Klaas, and death notices for a Peter Klaas follow in 1932. Other Klaas names like Albert, Carl, Christina (née Rubel), Dorothea, Helena (née Marten), Irene, and Joseph and also found in the local resource called "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
gary.rebholz@gmail.com, originator/compiler/editor, Milwaukee Wis.
Indexing Milwaukee's German newspapers continuously since 2007... a resource for family researchers who collect authentic evidence contemporary with their historic German-American families.