In my records, I have an Edmund Pendleton, b 27 Nov 1816 in Virginia, d 26 Mar 1880 in Winchester, Frederick Co, Va, and married Charlotte Ramsey Robinson 4 Dec 1847. They had two sons, Alexander Robinson Pendleton, b 27 Sep 1848 and Philip Clayton Pendleton, b 26 Nov 1850 and d 24 May 1863. Alexander Robinson Pendleton married Sarah G (D) Boyd.
Sources are: Descendants of Alexander Robinson and Angelica Kaufman Peale by William Carvil Hall (LDS Family Library Film #1486615). Also, Charles Willson Peale by Charles Coleman Sellers. Pub in 1947 by the American Philosophical Society in Philadelphia.