HItler's secret son

Does Adolf Hitler have a direct filiation? His mother's disclosures and several evidences allowed Jean-Marie Loret to believe he was the dictator's son. However, it was never proven. Today, two of his children want to know the truth: they start investigating. They tack their grandmother, Charlotte Lobjoie, who confessed having an affair during the World War with a German garrison soldier, a certain Adolf Hitler.