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.[1] [failed verification] Claims according to a NY Times book review were circulated as early as the 1920s that Hitler had Jewish ancestry. [1]