William Hitler was born in Liverpool, in the UK.
He was the son of Hitler's brother, Alois Hitler Jr., and his Irish-born wife Bridget Dowling.
William's parents met in Dublin when Alois was living there in 1909; they were married in Marylebone and moved back north to Liverpool, where William was born in 1911.
In 1933, William Hitler was in Nazi Germany, hoping to benefit from his uncle's rise to power.
"He travelled to Britain in 1937 where he gave an interview to the Daily Express declaring himself, in now heavily accented English, to be 'the only legal descendant of the Hitler family' and even striking poses adopted by his uncle...
"William declined to renounce his British passport in return for a top job in the regime. He then tried to blackmail the Führer.
"The details emerged years later at the Nuremberg trials.
"Hans Frank, the former Nazi lawyer responsible for millions of deaths while he was the Governor General of Poland, revealed how William had written to his uncle in the late 1930s threatening to expose the Hitlers' 'unusual family history'.
"It was a veiled threat that he would confirm the long-held rumour that Hitler's paternal grandfather was, in fact, a Jewish merchant, Leopold Frankenberger, who had had an affair with his grandmother, Maria, during her time in service to the family in Graz."
William threatened to reveal to the press that Hitler's paternal grandfather was a Jewish merchant.
In 1939, William fled Germany with the help of a British agent.
Adolf Hitler spent five months in Liverpool, allegedly to dodge being conscripted into the Austrian Army before World War One.
Hitler stayed in a flat in Liverpool with his married half-brother Alois from November 1912 to April 1913.
"The Officer Down Memorial Page Remembers... Special Agent Howard R. Stuart-Houston, ^ "Getting to know the Hitlers",