Dorcas, I will copy for you what sam demarcus just sent me re. this couple:
FA Ellis D. Marcus, MO Catherine Anthony, both b. Burke Co (old Caldwell Co.?) NC.Ellis D. b. 1790, Burke Co, NC; Catherine Anthony b. circa 1790s I suppose, Burke Co, NC.
Their two children:Wilborn (sometimes listed in census or marriage database as "Wilburn") b. circa 1812. Ellis M. Marcus, b. 1820.
Ellis D. had 5 more children with Nancy Penly between 1826 and 1843, perhaps even later.
The children of Demaris and Wilburn:
Sophronia Marcus, b. 1839, Burke Co, NC
m. 24 Aug 1859 to Ruben Setzer
Clarrissa Marcus, b. 1840, Caldwell Co, NC
Mira Marcus, b. 1842, Caldwell Co, NC
John Marcus, B. 1844
Polly Marcus, b. 1846, Caldwell Co, NC
Cornelius Marcus, b. 1848, Caldwell Co, NC
Columbus Marcus, b. 1859
Robert Marcus, b. 1862
The marriage of Wilburn and Demaris is listed in one of the online marriage records for Burke Co, NC;sorry, I have it somewhere in my notes, but do not find it at present.I believe I found it at one of the sites listed at Old Buncombe Co. Genealogical Society (OBCGS) online.
His brother, Ellis M., married Cynthia Bick, Burke Co, NC, 1845 (also listed in these records I believe.)
Their children are:John, b.circa 1846, d. aft. 1860, GA; Mary, b. circa 1847, d. after 1860, Rabun Co, GA; Nancy, b. circa 1848, NC
Joseph F. D. Marcus, b. Feb 1849; Louisa "Vicy", b. Feb 1852; Henry A., b. circa 1854; Tilman D., b. aft. 1856; George Soloman b. Rabun Co, GA, around 1858 and died 15 Dec 1932 Habersham Co, GA.
Also, the children of Ellis D. and Nancy Penly:Prudence Ellen Marcus, b. 1826; Lucinda "Cindy" Marcus, b. 1828; William Alfonzo Marcus, b. 3 Mar 1834 (nicknamed "Fonz"); Mary Frances "Frankie" Marcus, b. 1837; John Sylvanus Marcus, b. 1843 (called "Van").
This information was just sent to me recently, and have not yet had a chance to do further checking regarding the data, but I pass it along since it will be of use to you in your search also.