Question: Which country Princess Adelaide Of Schleswig-Holstein-Sonderburg-Glücksburg's mother is from?
Sentence (from "Princess Adelaide of Schleswig-Holstein-Sonderburg-Glücksburg"): Princess "Adelaide" Louise of Schleswig-Holstein-Sonderburg-Glücksburg (19 October 1889 – 11 June 1964) was a daughter of Friedrich Ferdinand, Duke of Schleswig-Holstein and his wife Princess Karoline Mathilde of Schleswig-Holstein-Sonderburg-Augustenburg.
Relevant evidence: Yes