I believe that the following explains who the mother was of Waddy Tate, son of John; and demonstrates that Mary Waddy did not marry John Tate until around 1750, and the offspring of that marriage was limited to one, Zedekiah, and he died before his father's death.
Louisa Co., Va. Deed Book H. page 477 -
10 March 1785 - Articles of Agreement between (1) Zackeus TAIT, of the COUNTY OF ORANGE, STATE OF NORTH CAROLINA, son of John TAIT, deceased, formerly of the County of Louisa, Virginia, of 1st part Ð (2) Zenas TAIT of City of Richmond, Virginia, son of John, deceased, of 2nd part Ð (3) Waddy TAIT, of COUNTY OF CASWELL, STATE OF NORTH CAROLINA, son of said John TAIT, deceased, of 3rd part and (4) Zephaniah TAIT, of the COUNTY OF GILFORD (sic) STATE OF NORTH CAROLINA, son of said John TAIT, deceased, of the 4th part Ð (5) Charles SNELSON of the County of Halifax, State of Virginia, representative of Mary, his wife, daughter of John TAIT, deceased of 5th part - and (6) Joseph STREET, of County of Louisa, Virginia, representative of Sarah, his wife, daughter of John TAIT, deceased, of 6th part - and (7) Anthony WINSTON, of county and state aforesaid, representative of his late wife, UPHAM, daughter of John TAIT, deceased, of the 7th part - and John TAIT, of the COUNTY OF ORANGE, STATE OF NORTH CAROLINA, son of (8) Zacharias TAIT, deceased, son of the said John TAIT, deceased, representative of his father as administrator of his estate and also of his father's orphan children, Sarah TAIT - Anderson TAIT and Richard TAIT, being their guardian, of the 8th part and (9) Zephaniah TAIT, aforesaid, as representative for John TAIT - Fanny TAIT - Sally TAIT - Hannah TAIT - Caswell TAIT - and Anthony TAIT, orphan children of John TAIT, deceased, being their guardian lawfully appointed, of the 9th part, etc., etc.
Refers to Will of John TAIT of Louisa Co., Virginia dated 25 November 1768 (which see) and his wife (and relict) Mary TAIT, his ten children, etc., aforesaid heirs appoint Zephaniah TAIT their legal attorney and agent, etc.
The signatures of the parties appear as Zacekis TAIT - Zenas TAIT - Waddy TAIT - Zephaniah TAIT - Charles SNELSON - Joseph STREET - Anthony WINSTON - John TAIT, administrator and guardian and Zephaniah TAIT, guardian. Proved and recorded Louisa Co., Virginia 14 March 1785.
10 March 1785 - Mary TAIT, of County of Louisa, widow of John TAIT, deceased, - for 90 pds. - Specie, relinquenches and quit-claims to the legatees of her said husband, her part of said estate and also her part of her son, Zedekiah TAITE, deceased, estate, etc.
Recorded 14 March 1785
The above documents of the 10 March 1785, really establish the children born to Mary Waddy Tate, wife of John Tate in the final settlement of the estate of John Tate as per his will dated 25 November 1768. The will mentions "HIS" 10 children; his wife and relict. Also on 10 March 1785, Mary Tait/Tate for the amount of 90 lbs, specie, relinquishes any claim to the estate of her husband and of her son Zedekiah. This was recorded 14 March 1785. The child by Mary Waddy Tate, Zedekiah was dead by 1784. This released the estate to the 10 children by Lucy Waddy, John TateÕs first wife; as she could have retained dower rights and held up the settlement.
Mary Waddy TateÕs will mentions none of the children by John TateÕs first marriage, nor of any of their descendants. She mentioned only her brother, John Waddy, as a beneficiary of her estate.
Cty. Louisa, Book: 2, Page: 180, Mary Waddy, Type: Will, Date: 13-Dec-1773
of Louisa, brother John Waddy have as much of my estate as I had from my grandfather Waddy as will make him equal with my other brothers and sisters as if my fathers estate were equally divided among them; sisters Frances, Elizabeth, and Ann Waddy. Written 27 Nov 1773, Rec: 13 Dec 1773; Adm: John Waddy; wit: Samuel Richardson, Molly Street(1)
There are some who feel that the first wife of John Tate was named Lucy, but that her family name was not Waddy. The problem with that is the given name of one of their sons, Waddy, could only have entered the Tate family with this marriage.