The Henry County (Ohio) Geneaological Society has a variety of databases available to search. If you select "Marriages" you will find that Milton W Fox and Mary Wenner married 4 May 1886 as you know. (Volume 6). They received their license to marry 3 May 1886.
1880 Census Bartlow, Henry County, Ohio leads us to Jacob and Caroline Wenner and their children: Malinda, MARY ELLEN aged 15 years; Abraham; Ida; James; Laura and Alma Wenner. Jacob was 43 years of age. Birthplace: France. Farmer.
Jordan Dodd, Liahona Research. Ohio, Marriages, 1803-1900. Jacob Wenner married 24 August 1860 In Hancock County, Ohio - Caroline Beck.