hi pal, i think that this is a county down family, alexander the oldest it seems is the son of mary, i think that mary was a widow when she came over to scotland with her family and that her husband may have also been called alexander.
as you can notice from the earlier posts on this thread, mary was given the birth year of 1781, so we maybe can assume that alexander may have been 1775-1780 and may have died around the 1830's in ireland.
it would be a wonderful start to the new year for jean if you can find anything in ireland concerning her family
Joe