Alice Fitzwalter married Aubrey de Vere about 1365. They had two sons and one daughter. Alice died 29 April 1401. 
Douglas Richardson, Plantagenet Ancestry: A study in Colonial and Medieval Families, (Baltimore, Maryland, 21202: Genealogical Publishing Company, Inc., 2004), page 737. Cited by Mr. Marlyn Lewis, Our Royal, Titled, Noble, and Commoner Ancestors & Cousins, database online, Portland, Oregon.