Did your Joseph Ebert die in 1915, at the age of 74 yrs? If so, there were family notices published for him in the local AM & PM German language newspapers. There are currently about 300 Ebert entries found in my growing index of these papers.
"Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
Gary Rebholz, compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007... helping to access our historic German-American culture.