I found these IGI entries, sons of William ANDERSON & Jean PORTEOUS: ANDERSON, George C: 1662/11/30 Edinburgh, MLN SCT ANDERSON, William C: 1665/01/22 Edinburgh, MLN SCT
Not having much luck finding a Jane/Jean b: c1766, but there are certainly PORTEOUS families in the Maybole area ... if you know anything more about the family, please post (children's names could be clue to parents).
slainte! Pat A. Winnipeg, Manitoba, Canada Volunteer Research Contact for . . . The Porteous Associates