Clarence A Hammond's marriage record says his father was Elsworth:
"Ohio, County Marriages, 1789-2013," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:X8R8-S4T : accessed 11 December 2015), Clarence A. Hammond and Marie A. Voigt, 24 Jun 1922; citing Hamilton, Ohio, United States, reference 208; county courthouses, Ohio; FHL microfilm 384,177.
This appears to be the family with several children in the 1905 Wisconsin State census, in Mount Pleasant, Racine County:
"Wisconsin, State Census, 1905," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MMQ9-GXX : accessed 11 December 2015), Clarence Hammond in household of Elsworth Hammond, Mt. Pleasant, Racine, Wisconsin; citing p. 234, line 91, State Historical Society, Madison; FHL microfilm 1,020,982.
Hope this is your man! Happy hunting. -NGP