"Theresa and John Imp came to the US from Austria in 1898 ... settled in Milwaukee and it is with them that Maria Feiler lived until her marriage. She called them "aunt" and "uncle"."

I may have posted a response to this elsewhere but it never hurts to repeat a good thing: there were death notices for a Theresa Feiler Imp (1940) and a John Imp (1936) published in the local German language newspaper (daily ed.).

"Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
For more specific information contact:
Gary Rebholz, compiler/editor
Milwaukee Wis.
gary.rebholz@gmail.com
Indexing Milwaukee's German newspapers continuously since 2007... helping to access our historic German-American culture.