No, not quite. It's yet another version of WWII wartime propaganda intended to undermine, cause doubt, and to divide. Hitler's father, Alois Hitler Sr. (1837–1903), was said to be the illegitimate child of Maria Anna Schicklgruber. Nazi official Hans Frank (Jewish) suggested that Alois's mother had been employed as a housekeeper by a Jewish family in Graz, and that the family's 19-year-old son Leopold Frankenberger had fathered Alois.[10]

No Frankenberger was registered in Graz during that period, no record has been produced of Leopold Frankenberger's existence,[11] and Jewish residency in Styria had been illegal for nearly 400 years and would not become legal again until decades after Alois's birth,[11][12] so historians dismiss the claim that Alois's father was Jewish. This comes from Wikipedia.

The "Hitler has Jewish DNA" myth is a remake of the earlier propaganda, that the above Hitler's grandfather was Jewish or half-Jewish. This lie was originally circulated as "black propaganda" by the communist opposition before the NSDAP came to power, then it was circulated again by Allied propagandists during the war, and repeated by Hitler's lawyer after the war in an attempt to avoid execution as a war criminal. This myth persisted until the 1970s, when respected historian and Hitler expert Werner Maser did a full reconstruction of Hitler's genealogy from county church records, going back 100 years. His conclusion: "Hitler's grandfather was not even a little Jewish". This comes from -- "Hitler: Legend, Myth, & Reality" by Werner Maser, 1973.

No, vot quite. It's wartime propaganda intended to divide.