I may have responded to this post elsewhere, but there are notices in local German newspapers for this Tews family: Gottlieb, Johanna, as well as for at least one of their children, named Johanna who died at 22yrs. Also possible matches to both of Gottlieb's parents Johann and Friedericke.
These are indexed in "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950). There are about 100 Tews entries found in the current data, and indexing continues.
For more information contact project originator/compiler/editor
gary.rebholz@gmail.com