Gwendolina Hyacinth Roma Mostyn (1864-1960) (1864–1960) Parents George Charles Mostyn Mary Monk Children Sir David George Home of Blackadder, 13th Bt. Siblings Myrtle Mabel Muriel Mostyn unknown Mostyn Hubert George Charles Mostyn, 7th Baron Vaux of Harrowden Beatrice Violet Mary Mostyn Ranulph Edward Montague Mostyn Harold Plantagenet Mostyn Partners Sir John Home of Blackadder, 12th Bt.