Photo by Rebecca S. Gratz for the Flatwater Free Press – Ernest Kobs says he feels relief knowing his family cemetery south of Bennington will be cared for well after he is buried there. The family cemetery is now part of a nature preserve owned and operated by the University of Nebraska at Omaha. BENNINGTON – Ernest Kobs knows his family history. He knows his great-grandparents both emigrated from Germany, married in 1870 and, in 1874, bought a…