Lois,
Information I have show Kaspar and Eckhardt as sons of Johannes Deiss b Sept 22, 1800 d. May 7, 1890 and married to Anna Margaretha Ruchelshaussen b Nov 14, 1804 d Jul 9, 1864. They were married 5 Apr 1825. I show Johanness being the son of Johann Peter Deiss b Jul 13, 1759 d Feb 14, 1831 married to Anna Maria Koch b Dec 14, 1770 d Jan 25, 1844. Johann Peter is the son of Adam Theiss b abt 1718 d Feb 16, 1783 married A. Cath. Winckelhausen d aft 1786.
I show a brother Andreas Deiss to Kaspar and Eckhardt - b Mar 2, 1826 d Dec 5, 1898 married May 30 1855 to Maria Dorothea Ruchelshaussen b Feb 8, 1826 d Dec 17, 1875 -- is this possibly the grave you saw? Andreas had a son Kaspar b Mar 2, 1857 and a daughter Dorothea b Nov 10, 1862. I'm not aware of any other childern.