In the same book you referred to is the following:
(Westmoreland Wills-abstracts) Will of Willoughby Allerton, gent., 17 Jan. 1723;8 April 1724. Land, stock and 3 slaves to wife Hannah; son Isaac land whereon I live and 800 acres of land and two-thirds of estate; dau. Elizabeth Allerton 200 acres and one-third estate; son exr; my wife's dau's. Hannah and Sarah Bushrod personal property of their father and mother. Land on Machotick; land formerly Capt. John Bushrod's and personal estate of his to my wife and her daus.; to wife the school master Joshua Nelson and 3 more white servants.