His elder brother Henry Percy, 6th Earl of Northumberland, who had long been failing in health, died after having been persuaded to leave all his estates to King Henry VIII. However, the earldom was restored to Thomas's eldest son, who was succeeded in the title by his younger brother, from whom all later Earls and Dukes of Northumberland are descended.
Mary Percy, wife of Sir Francis Slingsby; progenitors of all Slingsby Baronets
Catherine Percy, ancestor of American rapper Eminem.
References
^ abAdams, Arthur and Howard Horace Angerville (1959). Living Descendants of Blood Royal. London: World Nobility and Peerage, Vol. 4 page 417; (2) Charles Mosley, Burke's Peerage and Baronetage, 106th edition).
^ This article incorporates text from a publication now in the public domain: Burton, Edwin (1913). "Bl. Thomas Percy". In Herbermann, Charles (ed.). Catholic Encyclopedia. Vol. 14. New York: Robert Appleton Company.