From my research notes I find the following wondering if anyone else can confirm the correctness of this info.
Louisa County Virginia 1793 Probate record of William Thomasson
"Wills not fully proven p 46 - William Thomasson of St Martins Parish, sick, to my wife Unity Hicks, now Thomasson all estate now in the hands of Capt. Charles Yancey her brother - viz - L99 6s 4p which was placed in his hands to purchase a young negro for the benefit of myself and Unity and which he now refuses to do. After all debts are now paid, surplus to go to my wife, the children by my first marriage viz. Nancy and Betsy, Fanny and Polly, John and William and Winny Wright Thomasson shall have L40 cash paid by executors with interest from date of my death before delivering to my wife her heirs unless my wife relinquishes her right of dower in a tract of land which is my property on waters of Harris Creek near the Court House containing 113 acres she shall pay to my children before mentioned L50 out of the personal estate or any other part whether real or personal. Appoint my friends and brothers Nathaniel Thomasson and Elias Thomasson executors. 8 Aug 1793. Signed William Thomason witness Arch Dick, George B. Luck, 14 dec 1795. Proved by George B Luck and certified. The executors refusing to qualify William Thomasson qulaified as adminr. with the will annexed.
===== Notes By Dennis J Yancey dyancey @ miami.edu as far as I know: William Thomasson was the son of Samuel Thomson and Ann Payne William Thomasson married 1st Elizabeth Hallom and second Unity Hicks/Hix
Unity Hicks/Hix was the daughter of Prewid/Pewid Hicks/Hix and Temperance Dumas.
Temperance Dumas had first married Robert Yancey who died in 1746. That is why in the will Charles Yancey is referred as a brother (albeit half-brother) of Unity - they both shared the same mother - Temperance Dumas a lady of French origin.
Many researchers believe this same Temperance Dumas married (2nd) one Samuel Thomasson who died in 1753 in Louisa County - and that the marriage to Prewid Hix was her 3rd marriage. for the will of Samuel Thomasson see: