I think that the John Gebhart you are researching is John B. Gebhart, a son of George Schmidt and Magdalena Gebhart. John B. Gebhart's dates are 17 Aug 1841 to 5 May 1874 according to the information I have on him. His father George Schmidt Gebhart was born 12 Apr 1817 and died 8 Oct 1888. Both John B. and George S. are buried in Germantown Union Cemetery of Germantown, OH. George S. Gebhart's father was John George Gebhart (1776-1821). His father was John Heinrich Gebhart 1745 - 1815. Both John George and John Heinrich were born near Rehresburg, PA. They moved to Ohio around 1804-1805 and settled west of Miamisburg near Ellerton, OH. John Heinrich's father was Johann George Phillip Gebhart (1712-1792), and his father was Johann Peter Gebhart.