I am trying to research my Alexander line back farther than 1790. I currently have it traced to the marriage of Hugh and Mary Jackson, 17 Nov 1815, Dailly, Ayrshire, Scotland. They had 5 children. Janet (1821), Mary (1824), William (1826), James (1828) and Hugh (1831). Mary's parents were William Jackson and Mary McKelvie. Hugh's parents from his death certificate were John Alexander and Mary McPhie. Hugh's age at death on 27 Apr 1861 was 69 years. This would make him born after April 27, 1791. Any information on John, Hugh or Mary McPhie would be a great help.