Ralph, Could your Margaret be an older sister of John,son of Thomas of Lanark (see #3965)? My Alexanders settled in West Nottingham,Chester Co.,PA in 1736 also,but I come from a "Thomas,son of Thomas". I have been thinking he may have been a brother of the John mentioned. Sorry I have no proof or information for you, but I am hoping someone out there does! Good luck! I'll be watching!