I know that Frank and Lawrence Tuchfarber lived with the Joseph Fehr family for the 1880 Delhi census. I am a Klawitter related via the Wittich/Huenfeld/Tuchfarber connection. My family used to run "Klawitter's General Store" on Neeb Road.

All I know of the Fehr family is:
Joseph was from Baden, Germany. He was 37 during the 1880 census. Was he first married to Adeline Fehr? She was 33 during same census, and listed as his wife. However, later in my tree, I have an Appolonia Tuchfarber and Appolonia Rubein show up.
Joseph and Adeline had 3 kids in 1880: Charles J., Louise M. and Lizzie M.

I have 2 different Appolonia's related to the Tuchfarbers and Fehr's. The DOB for Appolonia Rubein Tuchfarber is 1822, and Appolnia Tuchfarber Fehr is 1847. The Appolonia born in 1847 married a Joseph Fehr on Nov. 13, 1866 and her mother was Mary Ann Piperger (or something like that, I have it at home, and if interested will get you the correct name/spelling for Mary Ann.)
Also Fehr Road in Delhi is named for this family, corner of Greenwell, in Delhi.
Hope this helps,
Anita @ alklawitter@health-partners.org