Katherine FitzGerald, Viscountess Grandison British noble (1660-1725) (1660–1725) Parents Sir John FitzGerald Katherine Power Children John Villiers, 1st Earl Grandison Harriet Villiers Mary Villiers Siblings Mary FitzGerald Richard FitzGerald Partners Edward FitzGerald-Villiers John Power, 2nd Earl of Tyrone William Steuart