Here is the obituary for Otto Junghans.
Otto was born September 2, 1861 in Germany and died June 16, 1931 in Mequon, Wisconsin.
While this obituary was limited in information, it did help me confirm I was on the right track when I was researching the family tree. The two surviving brothers mentioned would have been my great grandfather, Paul Richard and their older brother Carl (who had changed the spelling of his last name to Yunghans). Eldest brother Emil Yunghans had died two years earlier in 1929.