Question: What is the date of death of Ernst Gunther, Duke Of Schleswig-Holstein's mother?
Sentence (from "Ernst Gunther, Duke of Schleswig-Holstein"): However, on 11 November 1920, Ernst Gunther adopted Prince Johann Georg and his sister Princess Marie Luise, children of Prince Albrecht of Schleswig-Holstein-Sonderburg-Glücksburg.
Relevant evidence: No