Frances Stewart noblewoman; (1777-1810) (1777–1810) Parents Frances Stewart Robert Stewart, 1st Marquess of Londonderry Children Robert Fitzroy George FitzRoy Frances Fitzroy Siblings Lady Emily Stewart Octavia Stewart Lady Georgiana Stewart Charles Vane, 3rd Marquess of Londonderry Lady Caroline Stewart Lady Selina Stewart Lady Matilda Stewart Lady Selina Stewart Robert Stewart, Viscount Castlereagh Partners Lord Charles FitzRoy