Question: The following is a family tree for the Kings of the Hellenes of the House of Schleswig-Holstein-Sonderburg-Glücksburg, which ruled Greece between the election of Prince Wilhelm of Denmark (George I) to replace Otto of Greece in 1863, who was born Prince William of Schleswig-Holstein-Sonderburg-Glücksburg, on 24 December 1845, and was King of Greece from 1863 until his assassination in 1913?
Sentence (from "Grand Duchess Alexandra Georgievna of Russia"): She was a sister to Constantine I of Greece, and thus aunt of three kings and two queens, Constantine's three sons, who all became kings of Greece, and two of his daughters, who were queens, in name, of Romania and Croatia, respectively.
Relevant evidence: No