This is an old story. It seems to happen often that the head of the Nazi party or whatever finds out that he is a jew. It happned to the head of the local Nazi party when I lived in chicago years ago. Even Hitler had some jewish blood.
That is a myth. Hitler did not have Jewish blood. His real secret was the fact that a branch of his family had a horrible propensity for mental illness. Eventually this branch died out, but one historian recently learned that Hitler inadvertantly gassed one of his own cousins during the early Nazi period of euthanasia of the mentally retarded.