I have so many data-bases; at times, I really slip-up.
Yes, Stuart Emil Bergenske is your great-grandfather, born 22 Jan 1909 in Verona, Dane Co., WI. to Gust Frederick Bergenske (b. 19 Apr 1882, Verona, WI)and Hazel E. Slater (b. abt. 1892, Stephenson Co., IL.)
Gust was the second son of Michael John Bergenske (b. 10 May 1847) and Pauline Gust (b. 1849, Germany.) The story concerning Michael is complex; Pauline was his second wife and mother to all his children, other than his oldest daughter Martha.I'll provide much of what I've been able to uncover concerning his ancestors via snail-mail; but there are still so-many uncertainties.