Jean Pierre Clément Marie d'Orléans, Duc de Guise, was born 4 September 1874 in Paris, France to Robert de Chartres (1840-1910) and Françoise d'Orléans (1844-1925) and died 24 August 1940 Larache, Region of Tanger-Tetouan-Al Hoceima, Morocco of unspecified causes. He married Isabelle d'Orléans (1878-1961) .
Children
| Name | Birth | Death | Joined with |
| Isabelle d'Orléans (1900-1983) | |||
| Anne d'Orléans (1906-1986) | |||
| Henri d'Orléans (1908-1999) | 5 July 1908 Le Nouvion-en-Thiérache, Aisne, Hauts-de-France, France | 19 June 1999 Cherisy, Eure-et-Loir, Centre-Val de Loire, France | Isabel d'Orléans (1911-2003) |
Siblings
| Name | Birth | Death | Joined with |
| Marie d'Orléans (1865-1909) | 13 January 1865 Morgan House, Ham, Greater London, England, United Kingdom | 4 December 1909 Copenhagen, Denmark | Valdemar of Denmark (1858-1939) |
| Robert d'Orléans (1866-1885) | |||
| Henri d'Orléans (1867-1901) | |||
| Marguerite d'Orléans (1869-1940) | |||
| Jean d'Orléans (1874-1940) | 4 September 1874 Paris, France | 24 August 1940 Larache, Region of Tanger-Tetouan-Al Hoceima, Morocco | Isabelle d'Orléans (1878-1961) |