Question: Who is Prince Jean, Duke Of Guise's paternal grandfather?
Sentence (from "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.
Relevant evidence: Yes