Question: When did Princess Helena Adelaide Of Schleswig-Holstein-Sonderburg-Glücksburg's mother die?
Sentence (from "Princess Karoline Mathilde of Schleswig-Holstein-Sonderburg-Augustenburg"): Princess Karoline Mathilde of Schleswig-Holstein-Sonderburg-Augustenburg (25 January 1860, in Augustenborg, Jutland, Denmark – 20 February 1932, in Grünholz, Province of Schleswig-Holstein, Free State of Prussia, Weimar Republic) was the second-eldest daughter of Frederick VIII, Duke of Schleswig-Holstein and his wife Princess Adelheid of Hohenlohe-Langenburg.
Relevant evidence: Yes