Jody, Would you check on the Elizabeth Ross family in Chester Co.?I made a zerox of every paper in the Chester Co. Archives with name of Alexander and didn't find anything that would id his parents. They have well maintained records.Philadelphia and county may be a better source because of the land disputes of the time. I didn't check Genealogy,Historical Soc. or old history books in Chester Co. Let me know if you run across any Ross or Sanborn links.Wish you lots of luck. Pat in Oregon.