He married before Hilary term 1345 (date of lawsuit) Ada Botetourt, widow of Sir John de Saint Philibert. They had no issue.
Richard's wife Ada Botetourt was the daughter of Sir John Botetourt, 1st Lord Botetourt, by his wife, Maud, daughter of Sir Thomas Fitz Otes and great-granddaughter of William Longespée, 3rd Earl of Salisbury the son of Henry II of England
Sir Richard Fitz Simon died in 1348 or 1349, but the actual date is unknown.
^*Barber, Richard W. Edward III and the Triumph of England: The Battle of Crécy and the Company of the Garter. London: Allen Lane, 2013. p.513 ISBN9780713998382OCLC839314940
^ abShaw, Wm. A. (1971). The Knights of England: A Complete Record from the Earliest Time to the Present Day of the Knights of All the Orders of Chivalry in England, Scotland, and Ireland, and of the Knights Bachelors. Baltimore: Genealogical Publishing Company. p. 1. OCLC247620448.