Pedro d'Orléans

Prince Pierre d'Orléans was the son of François d'Orléans, Prince of Joinville and his wife, Princess Francisca of Brazil. On his father's side, he was the grandson of the French king Louis Philippe I. On his mother's side he was the grandson of Pedro I & IV, Emperor of Brazil and King of Portugal and the Algarves, for whom he was named.

Princess Françoise of Orléans (14 August 1844 – 28 October 1925), the older sister of Prince Pierre d'Orléans, is an ancestor of the three Orléanist pretenders to the throne of France since 1926: Jean III (her son), Henri VI and Henri VII. Pierre d'Orléans also had a younger sister who was stillborn (30 October 1849).

Although he never married, Prince Pierre d'Orléans had two children with Angélique Marie Augustine Lebesgue (d. 1881), a married woman:

Jeanne Angelique Marie Lebesgue (24 December 1879 – after 1903), who in 1903 would marry the Marquis Jean de Gouy d'Arsy, son of Count Antonin de Gouy d'Arsy and Wilhelmine (Minna) de Löwenthal

Pierre Fernand Eugène Lebesgue (12 July 1881 – 23 September 1962), who in 1941 would marry Yvonne Patrigean