Question: Who is Archduchess Margaretha Of Austria's maternal grandfather?
Sentence (from "Infanta Blanca of Spain"): Infanta Blanca of Spain (7 September 1868 – 25 October 1949) was the eldest child of Carlos, Duke of Madrid, Carlist claimant to the throne of Spain and his wife Princess Margherita of Bourbon-Parma.
Relevant evidence: Yes