My great uncle was called "Doc" Sanner. He practiced medicine in the Dubuque, Iowa area until he died back in the late 80's. He never married and was about 80-85 when he died. His brothers and sisters were Leo, Clarence, Loyola. Two sisters were nuns; Mary Innocentia and Margaret Mary. All are deceased. I don't know if this is the guy you are looking for but I wanted to pass along the information anyway. Good luck.