Louis II, Cardinal of Guise
Louis II, Cardinal of Guise( 6 July 1555, Dampierre – 24 December 1588, Château de Blois), was the third son of Francis, Duke of Guise, and Anna d' Este.
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.
François Joseph, Duke of Guise
François Joseph de Lorraine( Paris, 28 August 1670 – 16 March 1675, Paris), Duke of Guise, Duke of Alençon and Duke of Angoulême, was the only son of Louis Joseph de Lorraine, Duke of Guise and Élisabeth Marguerite d' Orléans," suo jure" duchess of Alençon.
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.
Prince Jean, Duke of Guise
Prince Jean of Orléans, Duke of Guise
(Jean Pierre Clément Marie; 4 September 1874 – 25 August 1940), was the third son and youngest child of Prince Robert, Duke of Chartres (1840–1910), grandson of Prince Ferdinand Philippe and great-grandson of Louis Philippe I, King of the French.
His mother was Françoise of Orléans, daughter of François, Prince of Joinville, and Princess Francisca of Brazil.
Catherine of Cleves
Catherine de Clèves( or de Nevers), Countess of Eu( 1548 – 11 May 1633) was the wife of Henry, Duke of Guise, and matriarch of the numerous and influential House of Guise.
By marriage she was Duchess of Guise from 1570 to 1588, and Dowager Duchess of Guise thereafter.
She was Countess of Eu in her own right from 1564.
Charles, Duke of Guise
Charles de Lorraine, 4th Duke of Guise( 2 August 1571 – 30 September 1640) was the son of Henry I, Duke of Guise and Catherine of Cleves.
Louis I, Cardinal of Guise
Louis de Lorraine( 21 October 1527, Joinville, Champagne – 29 March 1578, Paris) was the fourth son of Claude, Duke of Guise and Antoinette de Bourbon, and the younger brother of Charles of Guise, Cardinal of Lorraine, and Mary of Guise, queen consort of King James V of Scotland.
He was the nephew of Cardinal Jean de Lorraine.
He is sometimes known as the" cardinal de Guise".
Henry II, Duke of Guise
Henry II de Lorraine, 5th Duke of Guise( 4 April 1614, in Paris – 2 June 1664, in Paris) was the second son of Charles, Duke of Guise and Henriette Catherine de Joyeuse.
Antoinette de Bourbon
Antoinette de Bourbon Duchess of Guise( 25 December 1494 – 22 January 1583) was a French noblewoman of the House of Bourbon.
She was the wife of Claude of Lorraine, Duke of Guise.
Through her eldest daughter, Mary of Guise, she was the maternal grandmother of Mary, Queen of Scots.

Question: Who is Prince Jean, Duke Of Guise's paternal grandfather?
Answer: Prince Ferdinand Philippe, Duke of Orléans