I don't know if you are still looking for info on the Zueger family but Benedikt and Genevieve (Koch) Zueger are my great-great grandparents. Their daughter, Marie "Mary" is my great-grandmother and your John Zueger's sister. She is the same Mary you speak of in your inquiry. I have some pics of John, Mary, Lina (Rose), and Herman along with other family related to them.
Please contact me if you are still wishing info and I will be happy to share what I have with you. I live in the same county as your John Zueger.