There's lots on the ancestors of James Alexander at worldconnect.rootsweb.com. Look in database "hjackwells3" with id=I3611 [for James Alexander b. 8 Apr 1749]. Has LOTS of information --- just look at the ahnentaful for James! So far, I don't see any connection to James McFarland or his wife Rebecca. Daughter Nancy was born about 1780 so she apparently was about 25 when she witnessed the will [assuming I'm correct about it being Nancy and her parents who witnessed the will. James Alexander would be about the same age as James McFarland.