Margaret (Peggy) Mayson's parents were William Mayson and Mary Alderson. Have not found any more relations of William but did find Mary Alderson's parents who were Catherine Calvert and James Alderson. I'm still working on the Alderson line I'll post more about the family when I find anything.
Catherine Calvert's parents were Thomas Calvert and Margaret Metcalfe. Thomas Calvert's parents were Henery Calvert and Catherine Jackson, Margaret Metcalfe's parents were Alexander Metcalfe and Hannah Raw who had two other children that I have found records for so far, Robert born 1736 and Mary born 1740, they could have had other children since they were married in 1727.