Hi, have you tried the Karl Mundt library. they have a collection of Obituaries, and/or maybe able to tell you how to contact the Madison paper archives.
I see that he is buried in the Rosehill Cemetery but no maiden name on his wife.
I am from there and have family in the Rosehill Cemetery. Do you have the Wentworth Centenial book? There is an article on Mr. & Mrs. August Abraham,(Jr) said he moved to Wentworth with his parents August Sr. and Caroline. Sorry no last name.
Have you looked at any of the trees on Ancestry?
Wish I could be more help, Charli