Cecylia was the second child and only daughter of Prince Kazimierz Lubomirski and his wife Countess Teresa Maria Matylda Wodzicka z Granowa. Through her father, Cecylia was a great-granddaughter of Count Andrzej Artur Zamoyski and a great-great-granddaughter of Count Stanisław Kostka Zamoyski.[1]
Prince Jean Maria Casimir of Bourbon-Two Sicilies (born 30 June 1933 in Warsaw – died 25 December 2000 in Madrid)
Princess Maria Margarita Therese Antoinette Alfonsine Casimira of Bourbon-Two Sicilies (born 16 November 1934 in Warsaw – died 15 January 2014 in Madrid)
∞ Luis Gonzaga Maldonado y Gordon (born 17 November 1932 in Madrid) on 11 June 1962 in Jerez de la Frontera
Princess Marie Immaculata of Bourbon-Two Sicilies (born 25 June 1937 in Warsaw)
∞ Miguel Garcia de Saéz y Tellecea (6 September 1921 – 12 March 1982) on 29 June 1970 in Sant Josep de sa Talaia; divorced in 1979
Prince Casimir of Bourbon-Two Sicilies (born 8 November 1938 in Warsaw)