There are matches for their names at the Milwaukee Archdiocese cemeteries site: www.cemeteries.org
Use the genealogy button.
There are some Gelhaar spellings there, and most of the entries in "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950) are spelled that way. I don't have any entries for Anton or Anna. Some other surnames linked with Gelhar / Gelhaar include Matthäus Matthaeus Regan Benzing Zwonar.
Gary Rebholz, compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007... helping family researchers find their ancestors among Milwaukee's 99%.