This question contains spoilers… (view spoiler)[? Recent access to Hanfstaengl's archive in Munich, shows that much of his 'Memoir' is a cover-up . He worked for British agents (not MI5 or MI6) and the Americans/Canadians for many years.
Hitler did indeed kill Geli Raubal in a fit of rage, after he discovered who was the father of her child. Unity Mitford did attempt suicide on 3 September 1939, but unknown to her the ammunition in her pistol was blank. (hide spoiler)]