I have a copy of Franklin A. Burkhardt's "The Boucher Family" which lists Amos Bowsher (1803-1878) who was married to Catherine Heffner and their Francis M. Bowsher (1830-1912) m. 1st Ada Haynes, 2nd Elizabeth Strous.
However, your great-grandmother Essie Bowsher and her brother Oscar Bowsher are not listed in the book, nor is Charles Lewis Bowsher.
Francis & Elizabeth are shown to have a son, Charles F. Bowsher, b. 21 June 1869 who was married to Amanda C. Brincefield and then Amanda Shaffer.
How does your Charles connect to Amos & Catherine Heffner Bowsher?