Question: Who is Prince Robert, Duke Of Chartres's paternal grandfather?
Sentence (from "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.
Relevant evidence: No