Robert Eustace of Ballyloughrane had a daughter Anne who married Richard Eustace, brother of Roland FitzEustace, Lord Portlester. Thomas Eustace, son of Richard and Anne Eustace became 1st Viscount Baltinglass.

Richard Eustace was alive 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. .