I am reading "Go-Betweens for Hitler" by Karina Urbach. The book details Royals and Aristocratics who acted as go betweens between the Powers during the Two World Wars.

One of the figures discussed is Prince Charles Edward of Albany, later Duke of Saxe Coburg Gotha. He was of course an English prince who was sent to Germany to take over the Duchy of Saxe Coburg Gotha, under the wing of the Kaiser, and later became a prominent Nazi. The author paints a negative picture of Charles Edward's relationship with his children. Was the young Carl Gustaf close to his German grandfather (he was 8 when his grandfather died). The book states Sibylia was very close to her brother Hubertus, who was killed in action in 1943, and was homosexual. Carl Gustaf has Hubertus as a Christian name. Sibylia's sister Caroline Mathilde was estranged from her father, had a complicated love life and spent time in prison according to the book. She also made serious claims against her father according to the book. Did Sybilia have a relationship with her after moving to Sweden?