I know this is an old post, but I stumbled on it again... I also see that you are on my DNA match list, so we are for sure related.
I believe that John Soehnlein, that came to Buffalo was from Wiesbaden. My grandmother (Alfred's wife leona, Alfred was one of Frank's brothers), talked about the people in Germany having a winery, but all contact was lost during WWII. My mother remembers my grandfather well & liked him very much, but he dies very young at 59 from a stroke, I in 1965. We have seen a pastel portrait on lead, of John and I think his brother Christian (?) who came over to the US together from Germany. I have to see if someone in the family still has that. The reason I'm looking into all this again is that my daughter is an exchange student in Germany this year in the Frankfurt area, very close to Wiesbaden.