Question: When is Prince Frederick William Of Schleswig-Holstein-Sonderburg-Augustenburg's mother's birthday?
Sentence (from "Prince Frederick William of Schleswig-Holstein-Sonderburg-Augustenburg"): He was the youngest son of Duke Ernest Günther, Duke of Schleswig-Holstein-Sonderburg-Augustenburg and his wife, Auguste of Schleswig-Holstein-Sonderburg-Glücksburg.
Relevant evidence: Yes