The genetic background of Adolf Hitler has been widely disputed. One view claims that he is purely of Austrian descent. Another view that has been pushed forth by a number of groups is the Frankenberger thesis, which maintains that Leopold Frankenberger was the father of Hitler's father Alois Hitler. The Frankenberger family paid child support for Alois Hitler for 13 years. Claims according to a NY Times book review were circulated as early as the 1920s that Hitler had Jewish ancestry. No Frankenberger was registered in Graz during that period, no record has been produced of Leopold Frankenberger's existence, so historians dismiss the claim that Alois's father was Jewish. Additionally a claim by Nazi sympathizer that there were no Jews in that area by Nikolaus von Preradovich. This though runs contrary to evidence that there were competing claims by Leonard Sax of Jews in the Austrian town prior to 1850. Nephew claims Hitler's nephew William Stuart-Houston tried to blackmail Hitler by stating he would release to the press that Hitler had Jewish ancestry. This was investigated by Hans Frank who was Hitler's personal lawyer. Hans Frank stated during the Nuremberg Trials in 1945-1946 that he investigated those claims and there was no evidence to support this theory. As Hitler was allegedly Jewish through the paternal line, he cannot be Jewish via religion, only genetically. Claims of being Jewish based on having Jewish blood There are claims of Hitler being Jewish based on the Nuremberg Laws or non religious ancestry which pushed forth the belief that having Jewish ancestry on either side of your family gives a person as being Jewish. This is pushed by the Frankenberger thesis After Hans Frank was executed in the Nuremberg Trial, his memoirs were published and this brought forth the claim that Hitler had in fact Jewish lineage. DNA As evidence of Hitler's background has come up, there has been DNA evidence that stated Hitler did have possible Jewish ancestry. DNA samples were taken from Hitler's relatives and a number of theories were produced. <ref name"auto2"/> One was that Hitler had E1b1b Haploid group, which is rare amongst Western Europeans but relatively common amongst North Africans and Jews.<ref name"auto2"/>