Henry Albert de Vreque O'Brien-ffrench, 1st Marquess of Castel Thomond (1862-1933) (1862–1933) Parents Acheson Jeremy Sydney ffrench Anna Clarke Watton Children Conrad O'Brien-ffrench Winifred Gisela Yvonne Castelthomond O'Brien-ffrench Rollo Adrien Vladimir Thursby Marie Altieri O'Brien-ffrench Alexis Evelyn Henry O'Brien-ffrench Siblings Lucius ffrench Edward Victor ffrench Anna ffrench Robert Percy ffrench Emily ffrench Nichola Frances ffrench John Ludlow ffrench Harriet Maria ffrench Marianne ffrench Amy ffrench Acheson Evelyn ffrench Alice ffrench Partners Winifred Thursby