*WYNN* Looking for ancestry of John D. Wynn b. abt 1861 and wife Katherine

John D. Wynn b. abt 1861 in Ohio married Katherine ? b. abt 1875 in Missouri. Moved to Marshall County, Kansas before 1901, had 4 sons: Clarence Willard Wynn, (b. 1901), Francis (b. 1903) , Harold (b. 1906), Gordon (b. 1908).

John and Katherine would be my g-g-grandparents (Clarence Willard was my g-grandfather). Any information will be helpful. Thank you.