Have you collected family death notices/obituaries in the local German papers for your Papke family? For instance, there were notices and an obit. for the Henriette Papke listed in your posting.
These are indexed in the collection: "Milwaukee's German Newspapers; an index of death notices and related items", covering 1844-1950. This independent project was started in 2007 and continues today.
You can use the index at the Salzmann Library in St. Francis (Milwaukee Co.). But look-ups are available via email.