Daddy Horst Kasner was a member of the Hitler Youth. Born 1926.
Angela Hitler was Adolf's older half sister. She had a daughter Angela "Geli" (Raubel) born 1908, and when Angela moved into Hitler's compound (1925) to be his housekeeper, Hitler had a strange relationship with Geli. Probable incestuous? Adolf kept tight control over her, and ultimately she died of a gunshot wound to her chest 19 September 1931. Ruled a suicide, but started some serious rumors. Hitler descended into depression, declared Geli the "only woman he ever loved."
First sons given fathers' names, first daughters given mothers' names. Is Angela Raubel actually Merkel's grandmother? And Hitler her grandfather/great uncle? Merkel birthdate 1954.
Daddy 1926, if born to Geli means impregnated 1925, when moved in with Adolf. Illegitimate children were often fostered out, then as even now in certain communities. Hitler's illegitmate son Horst (if this is true) would have been adopted out. Adoptive father a policeman in Berlin. All fits.