Question: Who is Prince Robert, Duke Of Chartres's paternal grandfather?
Sentence (from "Ferdinand Philippe, Duke of Orléans"): Prince Ferdinand Philippe of Orléans (3 September 1810 – 13 July 1842) was the eldest son of Louis Philippe d'Orléans, Duke of Orléans (the future King Louis Philippe I) and Maria Amalia of Naples and Sicily.
Relevant evidence: Yes