I know very little. But my grandmother's grandfather on her mother's side was Thurmer. Does any of this ring with your Thurmers?
Kaukauna, Wisconsin/Fox River area:
Thurmer m. ???
Callahan m. Thurmer
Denise Thurmer Callahan, ~1902-1979?, m. Robert Baker, Chicago, IL, no children (Bob worked for Wisconsin Gas, best man to Albert Emery Gilbert below...)
Helen Thurmer Callahan, 1900-1984, Kaukauna WI m. Albert Emery Gilbert, b. 1906, ???, KY, then a tailor in Chicago, IL
2 children: Jerry Lee Gilbert and Virginia Gilbert Herkert, both living w/ children