"Windows Into Our Past A Genealogy of Lewis Green & Associated Families, Volume 6", compiled by Judy Parsons Smith 2005

Listed in Cavaliers & Pioneers Abstracts of Virginia Land Patents and Grants 1623-1800, by Nell Marion Nugent, we find the following:

Robert Burwell , wife and 3 children out of Holland transported by Peter Knight  who was given land in Northumberland Co. 18 Mar 1662 for transporting two persons. P. 295  

It is this Robert Burwell  who we believe may have been the father of the wife of William Grigg .  The dates for such are probable.