Individual Details

There was an earlier Cuthbert Williamson - kinship unknown, see notes of Cuthbert's father Thomas..
VA Patent Bk 6, p.562 16 Jun 1675 Cuthbert Williamson, 144A, Charles City Co, N side James R; Berkeley's line, Ashen Swp. Transport 3 persons.
VA Patent Bk 7, p. 187 22 Sep 1682 John Royster, 97A Chas. City Co, Westover Parish East side Chimidges Creek, N side James R.; Cuthbert Williamson, Mrs. Bland's, crossing Turkey Branch

This one also seems a bit early or he was perhaps a bit older than suggested:
VA Patent Bk 11, p.80 13 Nov 1721 Cuthbert Williamson, 85A Pr .Geo.Co; North side Johnes' Hole Swp, his own land, head of Cherry Orchard Br or Sw.
VA Patent Bk 14, p. 21 28 Sep 1728 John Hill & Cuthbut Williamson. 360A Pr Geo.Co, both sides Rockey Run.
Virginia Genealogical Society Quarterly, Vol 25, Number 2, p. 61
Land Patent Book 18
John Hill, Jr., 400a, Pr George Co, both sides Rockey Run of Stoney Cr adj. John Hill, Cuthbert Williamson, Thomas Hardaway & Charles Williamson. 20 Jul 1738.
John Hill, 232a, Pr George Co., both sides Rockey Run of Stoney Cr bounded by the old joint tract taken up by him & Cuthbert Williamson on upper side of Russel's meadow, Hardaway & William Parson. 20 Jul 1738.

Found online - quotes about relationships not added by me.
April Court 1743. John Williamson [brother of deceased] and Elizabeth Williamson [wife of deceased] appointed executors of Cuthbert Williamson, deceased, present his will which is not signed. John Maddox states he was asked by said Cuthbert to go to John Price to get him to write the will. When Price came to the house, he was afraid to go into the room because said Cuthbert was sick with the flux. Will was written on directions given by Cuthbert, and later read to him by John Williamson and deceased said it was very well. John Price deposed that he wrote will on instructions given by John Maddox. Will was admitted to probate, Robert Sharp, Benjamin Burton, and James Cocke, securities. Elizabeth Williamson, relict and widow of Cuthbert, relinquished all benefit and advantage to herself from said will. Henry Stokes, John Watson, Matthew Hobson, and John Mosby to appraise. (Henrico Co., Virginia, Records, p. 182)

September Court 1743. John Williamson presented inventory of Cuthbert Williamson, deceased. (Henrico Co., Virginia, Records, p. 230)

December 2, 1754. Pursuant to court order of June 6, 1751, we deliver to Elizabeth Allen 1/3 of estate of Cuthbert Williamson, deceased. Signed by Philip Mayo and William Lewis. (Henrico Co., Virginia, Records, p. 230) [Cuthbert's wife had married Samuel Allen.)


Did Cuthbert also have a brother John or is this a different family?
The Will of John Williamson, Surry Co VA, dated 30 Jan 1731/32:
John Williamson names his daughter Elizabeth, wife of Hollum Sturdivant and gives her iron pots. Daughter Susannah Rottenbury, wife of John Rottenbury received 249.5 acres of land on the S side of the Nottoway R in Surry Co where they were living, plus an iron pot & hooks, a rug and a bed tick. Daughter Edith Williamson, slave girl, feather bed and bedding, iron pots, bay horse colt and a gray mare bought of Richard Fox. Daughter Hannah Fox, wife of Richard Fox, livestock, feather bed, credit due on the store book of Thomas Eldlbridge. Son Cuthbert, slaves, horses, Troopers arms, saddles, clothes, livestock. Whatever is in his house is to be used for the benefit of Edith and Cuthbert. Brother Cuthbert Williamson and friend Robert Green are to be supervisors to son Cuthbert until he reaches age 21. Any remainder to Edith and Cuthbert. No wife mentioned.
Signed: John (X) Williamson
Wit: Judith (X) Harper, Edward Farrington
Probate: 17 May 1732.

Birth	Abt 1704
Death	Abt 1743	Henrico County, Virginia
Marriage		ELIZABETH Curd

Spouse	ELIZABETH Curd ( - 1786)
Child	MARY Williamson (1733 - )
Child	Susanna Williamson (1735 - )
Child	Cuthbert Williamson (1740 - 1812)

Father	THOMAS Williamson ( - 1742)
Mother	SUSANNAH Carter (1671 - )
Sibling	Living
Sibling	Hannah Williamson (1698 - )
Sibling	Richard Williamson ( - 1771)
Sibling	Susannah Williamson ( - )
Sibling	Living