Prince Henri of Orléans
Prince Henri of Orléans (16 October 1867 – 9 August 1901) was the son of Prince Robert, Duke of Chartres, and Princess Françoise of Orléans.
Henri, Count of Paris (1908–1999)
Henri of Orléans, Count of Paris( Henri Robert Ferdinand Marie d' Orléans; 5 July 1908 – 19 June 1999), was the Orléanist claimant to the throne of France as Henry VI from 1940 until his death.
Princess Claude of Orléans
Princess Claude of Orléans( Claude Marie Agnès Catherine; born 11 December 1943) is a French princess of the House of Orléans.
She is the former wife of Prince Amedeo, Duke of Aosta, a disputed head of the House of Savoy.
Duchess Marie-Thérèse of Württemberg
Duchess Marie Thérèse of Württemberg (born 12 November 1934) known as Duchess of Montpensier, is a German-born aristocrat.
A daughter of the claimant to the royal throne of Württemberg, abolished in 1918, she was the first wife of Prince Henri, Count of Clermont.
Duchess Marie Thérèse is the mother of Prince Jean, Duke of Vendôme, head of the House of Orléans and Orléanist claimant to the French throne.
Philip, Count of Vertus
Philip of Orléans, Count of Vertus( 21/24 July 1396 – 1 September 1420), was the second son of Louis I, Duke of Orléans, and Valentina Visconti, and a grandson of Charles V of France.
His older brother was the noted poet Charles, Duke of Orléans and his younger brother was John, Count of Angoulême.
Charles Belgique Hollande de La Trémoille
Prince Charles Belgique Hollande de La Trémoïlle( May 1655 – 1 June 1709), 4th Duke of Thouars, was a French nobleman.
He was the second child and eldest son of Prince Henri Charles de La Trémoille( son and heir of Prince Henri de La Trémoille, 3rd Duke of Thouars and his wife Princess Marie de La Tour d' Auvergne of Bouillon) and his wife Princess Emilie of Hesse- Kassel( daughter of Prince William V, Prince of Hesse- Kassel and his wife Countess Amalie Elisabeth of Hanau- Münzenberg).
Brought up a Calvinist, in 1668 his father had converted to Catholicism and then forcibly converted his children as well.
His mother and eldest sister fled to the Netherlands.
Prince Robert, Duke of Chartres
Prince Robert Philippe Louis Eugène Ferdinand of Orléans, Duke of Chartres (November 9, 1840 – December 5, 1910) was the son of Prince Ferdinand Philippe, Duke of Orléans, and thus grandson of King Louis-Philippe of France.
He fought for the Union in the American Civil War, and then for France in the 1870 Franco-Prussian War.
In 1863 he married his cousin Princess Françoise of Orléans, the daughter of François, Prince of Joinville.
In 1886, he was exiled from France.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Princess Anne of Orléans
Princess Anne of Orléans(" Anne Hélène Marie"; 5 August 1906, Le Nouvion- en- Thiérache, Aisne – 19 March 1986, Sorrento) was a member of the House of Orléans and the Duchess of Aosta by marriage.
She was the daughter of Prince Jean, Duke of Guise and Princess Isabelle of Orléans.
Princess Marie of Liechtenstein (b. 1959)
Princess Marie of Liechtenstein(" née" Princess Marie Isabelle Marguerite Anne Geneviève of Orléans; born Boulogne- Billancourt, France on 3 January 1959) is the eldest daughter of Prince Henri, Count of Paris, Duke of France and his former wife Duchess Marie Thérèse of Württemberg.
She is the wife of Prince Gundakar of Liechtenstein, a great- grandson of Prince Alfred of Liechtenstein.

Question: Who is the paternal grandfather of Prince Henri Of Orléans?
Answer: Prince Ferdinand Philippe, Duke of Orléans