Haaretz is not remotely an unbiased source, but they still included this:
"Hitler, he said, told him that because his grandmother and her future husband were poor, they persuaded the Jewish man to believe he was the child’s father in order to receive his financial support."
And if anyone believes that, I have a bridge to sell you over the Wein.
True, but this comes from Hans Frank's memoirs. His son then wrote a biography of him called Shadow Of The Reich where he basically says his father was a cunning liar who would have said anything for a place in history and posted excerpts from personal diaries comparing with his memoirs.
Hans Frank had nothing to gain at that point and he was far from the first to say this.
Most Jewish people, then and now, find the idea horrifying, and publish many flavours of cope and denial.
The Daily Telegraph funded a DNA test.
In 2010, the British paper The Daily Telegraph reported that a study had been conducted in which saliva samples were collected from 39 of Hitler’s known relatives to test their DNA origins and found, though inconclusively, that Hitler may have Jewish origins. The paper reported: "A chromosome called Haplogroup E1b1b1 which showed up in [the Hitler] samples is rare in Western Europe and is most commonly found in the Berbers of Morocco, Algeria and Tunisia, as well as among Ashkenazi and Sephardic Jews ... Haplogroup E1b1b1, which accounts for approximately 18 to 20 percent of Ashkenazi and 8.6 per cent to 30 per cent of Sephardic Y-chromosomes, appears to be one of the major founding lineages of the Jewish population." This study, though scientific by nature, is inconclusive.
It's also not uncommon in Austria (8.6%) and the Belgian journalist who confirmed the haplogroup specifically said that it didn't mean he was Jewish (he was doing this to confirm a guy who was claiming to be Hitler's son was a fake). They could confirm this one way or the other with a more comprehensive DNA test
