Update 9-10-16
Mom and I spent last weekend going over these pictures, plus with some help from cousin K. Hess, we were able to have an "ah-ha" moment and come up with some answers. There are actually 4 known photos taken of the John Ressler family at the farm on Thanksgiving Day 1915. I will add the other 2 at a later date.
For now the photo above is written in Uncle Andy's handwriting (son of Frank Ressler) so it is from his perspective. Dad is Frank Ressler, Aunt Stella is Estella (Ressler) Andrews, Uncle Harry is Harry Ressler, and Uncle John is probably Daniel Ressler - these would be the four living children of John and Elizabeth (Yost) Ressler at this date. John (1850-1925) and Lizzie (1855-1925) are the seated couple.
Update 9-10-16: Many of the people in this picture are still not named, however, we are making progress. The seated couple is John and Lizzie Ressler with their living children and grandchildren. There are also some misc. people in the picture that so far no one has figured out.
The back row has 2 unnamed women, Harry Ressler, Frank Ressler, Claire Ressler is directly in front of Frank, Galen Andrews, John Ressler behind Lizzie's shoulder, Daniel Ressler and Stella (Ressler) Andrews.
The second row is Emma Ressler, unnamed seated woman holding Grace Ressler(?), John and Lizzie, unnamed woman, probably Paul Ressler.
The children in the front are: Blanche Ressler, unnamed, Anna (big bow in hair - daughter of Daniel), Reba is the small one in front of her, unnamed 2 boys (?) in front of Lizzie, Martha (?), Anna (daughter of Frank) and Stella (daughter of Harry).