As was Adolf Hitler:
Nazi leader Adolf Hitler had Jewish and African relatives, DNA test suggests
http://articles.nydailynews.com/2010-08-24/news/27073535_1_dna-test-relatives-samples
As to Adolph, I haven't a clue about his relatives dna, but the usual canard is that his grandma, a housekeeper, was raped by her employer, a Jew. That's it, she worked for a Jew so he must have had his way with her, that's what Jews do. Not much there. Which isn't to say Adolph couldn't have heard that story, though I think it arose only after he rose to prominence.
It makes for interesting conversation and speculation, but nothing beyond that.