I have OPR's for Betty, bpt August 5 1820 at Hawick and her MI suggests born 1761. The OPR only records daughter of Thomas Harkness. Edward, bpt 30 March 1793 at Middlebie, residence Lauriesclose; John, on the MI born 1782, died at Stidriggburn; William, bpt 3rd Feb 1796, Middlebie. The OPR's for Edward and William show them to be sons of both Thomas and Hannah.
I have a marriage for Edward, 30 October 1829 at Graitney, to Margaret Byers. John married to Mary Little according to their MI.