Richard Eustace, Portlester's brother, is a dim figure of whom we know nothing, except that he was living in 1493 and had two sons: Sir Thomas, later Viscount Baltinglass; and Sir Richard, who married Anne, daughter of Sir Robert Eustace of Ballycotland, and had a daughter Margaret who married George Barnewall of Arnoldstown. Anne later married Sir Maurice FitzGerald of Lackagh. . Richard Eustace’s wife probably was probably Anne, daughter of a Robert Eustace of Ballyloughrane. He died before Roland FitzEustace, Lord Portlester.