He married a woman named Mary Johnston and the union produced a son , David Maitland - Makgill - Crichton ( 1801 -- 1851 ) .
The eldest son , Charles went on to inherit the estates on his father 's death and assumed the surname Makgill .
son married a woman named Mary Johnston and the union produced a son , David Maitland - Makgill - Crichton ( 1801 -- 1851 ) .
The eldest son , Charles went on to inherit the estates on his father 's death and assumed the surname Makgill .