I case it's helpful to your research, the family published death notices in the German papers for Bertha Giese Hoppe in 1926, and there are a couple of entries for a Ferdinand Hoppe in "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950). There are over 200 entries or references to the surname Giese in the index. Who knew!
Gary Rebholz, compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007... helping to access our historic German-American culture.