I just saw the abstract for Charles' will (thanks, Kristina!). To wit:
Charles Grandy. Book 5 f. 27. Dated 14 Feb. 1686. Proved 15 July 1687
According to his will, Charles Grandy had four sons at the time of his death: William, John, Charles, and Thomas. He also had a daughter named Mary Hattersly.
There is a Thomas Grandey in CURRITUCK CO. NC TAX RECORDS
1696 Tithables. The same Thomas Grandy?
Also, John Sawyer’s will (22 Dec 1713) lists "grandson: Charles Grandy."
More pieces to the puzzle! Thanks.