From a Lucas family bible, we know that Elizabeth H. Milam was born in Stewart Co. TN and was the daughter of William and Mary Milam. I am tentatively connecting Elizabeth to William Milam, son of Rowland Milam while I continue my research.
Stewart County, TN and parents born in NC are 2 good clues. Adam Milam of Warren County, NC died 1789 and left a will. 3-4 of his sons removed from NC to Stewart County, TN about 1800-1809. One son, Rowland Milam, had a son named William Milam (b. abt 1794, NC) who married Mary Lowery, (also b. NC abt 1798.)