David, my father was an ophthalmologist in Milwaukee! How fun to find out that he was your eye doctor.
When I tried to send you a message, I simply went to your profile on Ancestry and clicked on the icon to send you a message. I was never able to actually send anything because Ancestry kept sending me to the page asking me to start my trial membership. But I will send you an email soon.
Margo sent me the photo of the Jeske Family, but it turned up in my spam folder. You might check there if you haven't received it yet.
Regarding Christina Hartmann: she married Carl in 1854, gave birth to Gustav in 1855, and died in 1859. Carl married Ernastina in 1860.
I will send you an email shortly. Please keep an eye out for it!