One of Murphy's Law of Genealogy...
The only record you find for your great-grandfather is that his property was sold at a sheriff's sale for insolvency.
[S6] NEW BRAUNFELS: THE FIRST FOUNDERS, VOL II, Fey, Everett Anthony, (Eakin Press, Austin, Texas, 1994, ISBN 0-89015-987-4, Vol. II The Genealogies), p. 205.