Question: When did Princess Helena Adelaide Of Schleswig-Holstein-Sonderburg-Glücksburg's mother die?
Sentence (from "Friedrich, Duke of Schleswig-Holstein-Sonderburg-Glücksburg"): Friedrich of Schleswig- Holstein- Sonderburg- Glücksburg( 23 October 1814 in Schleswig, Duchy of Schleswig – 27 November 1885 in Luisenlund, Schleswig- Holstein, Prussia) was the third Duke of Schleswig- Holstein- Sonderburg- Glücksburg.
Relevant evidence: No