Yes, my Daehler/Dahler family is from Fairhaven, IL, not far from Chadwick, Mt. Carrol & Sterling. In fact, I was born in Sterling. Konrad Dahler/Daehler is my ggg grandfather. I will try to e-mail you the answers to you other questions. It may be a few days though, as I broke my foot and am unable to get to the book until I get rid of the crutches.
Thank you,
Donna Rae