Answering my own post! Found transcription of will:
Charles Campbell - Will Book B, Page 379 - Names wife, Mary; sons, James, Robert and William; daughter, Polly Watson (wife of David); daughter, Rachel; sons, Charles and Hugh. Written March 12, 1812. Probated July, 1812. Executors--Mary Campbell (wife), Hugh Campbell (son), Andrew Wallace (son-in-law). Witnesses--Richard Hunter, James B. Bruster, William Boon.
I am now wondering how a son, George W. Campbell, is attributed to Charles and Mary Alexander on Ancestry.com?