Question: Who is Princess Isabelle Of Orléans (1900–1983)'s paternal grandfather?
Sentence (from "Princess Isabelle of Orléans (1900–1983)"): She was one of the four children of Prince Jean, Duke of Guise (1874–1940), who would became the Orleanist pretender to the French throne in 1926, and his wife Princess Isabelle of Orléans.
Relevant evidence: Yes