Jean-Marie Loret, who died in 1985 aged 67, never met his father, but went on to fight Nazi forces during the Second World War.
Apparently Hitler was already bent early on in his life:
Miss Lobjoie later told Jean-Marie: "When your father was around, which was very rarely, he liked to take me for walks in the countryside.
"But these walks usually ended badly. In fact, your father, inspired by nature, launched into speeches which I did not really understand.
"He did not speak French, but solely ranted in German, talking to an imaginary audience
Of course Hitler-iana is a popular field for hoaxes, and this may not be true. (Remember the diaries?)
But if the story is true, his mother gave him up for adoption, and only told him about his father shortly before she died in the 50's. Jean-Marie Loret had fought the Germans during WW-II, and even joined the resistance, so this was a bit of a blow.
Mr Loret said: "In order not to get depressed, I worked non-stop, never took a holiday, and had no hobbies. For twenty years I didn't even go to the cinema."
But leave it to a lawyer to notice that:
Mr Gibault said that Mr Loret's own children might now be in a position to claim royalties from Mein Kampf ('My Struggle'), Hitler's famous book which has sold millions of copies around the world.