According to Mayflower Families in Progress, Willoughby Allerton married Hannah (Keene) Bushrod, b. St. Stephen's Parish, Northumberland Co, VA 4 Feb 1676/7; died after 26 Dec 1738 (date of her will); dau. of William and Elizabeth (Rogers) Keene. She m. (1) in Virginia ca. 1694 John Bushrod - children Elizabeth, Sarah, John, Hannah, Apphia, Richard and Thomas.Willoughby was her second husband and she was his third wife.She married(3) Dr. John Cooper ca. 1725 Westmoreland Co., Va. (also have married names of some of her daughters)
Elizabeth Allerton b. Westmoreland Co., VA ca 1708 d. after 12 May 1747.Married Northumberland Co., VA ca 1734 Matthew Zuille. b. Northumberland Co. VA 1701; d. Philadelphia PA before 3 Sept 1766.their children Sarah b.a. 1735; d. after 3 Sept 1766. unm. Margaret b. ca. 1737, Robert b. ca. 1737Elizabeth was the daughter of Willoughby by his second wife Sarah (Traverner) Travers.