[2] Through his father, he was a great-grandson of Louis-Philippe I, King of the French and his wife Queen Maria Amalia of the Two Sicilies.

His maternal grandparents were Infanta Luisa Fernanda of Spain and Prince Antoine, Duke of Montpensier (the youngest son of Louis-Philippe of France and Maria Amalia of Naples and Sicily).

[2] The Duke lived in England for many years, until "his reported indiscretions with regard to his recollections of Queen Victoria made it somewhat uncomfortable for him when in London.

[3] In the fall of 1923, the French government bestowed upon him the Cross of Officer of the Legion of Honour for his services to his native land.

[4] On 20 August 1921, Ferdinand married Doña María Isabel González de Olañeta e Ibarreta (22 April 1895 – 11 July 1958), 3rd Marchioness of Valdeterrazo and Grandee of Spain, 2nd Viscountess of los Antrimes, at the Château de Randan in Randan, which he inherited from his mother.