Hitler's father, Alois, was born illegitimately in 1837 to Maria Anna Schicklgruber. The father's name was left blank on his birth certificate. The rumors were given a boost by Hitler's own lawyer, Hans Frank, who claimed in his post-execution memoirs that he had found evidence that Hitler's grandmother had worked for a Jewish family named Frankenberger in Graz, Austria, and that a son of the family had fathered Alois