1837: June 7, Alois (Adolph Hitler’s father) is born illegitimately from the 42-year-old Maria Schickelgruber, most probably to the 19-year-old heir of the Jewish Frankenberger family of Graz. (Maria had been employed by the Frankenberger family in Graz as a sewing-maid at the time she fell pregnant).
Maria receives financial support up until Alois’ birth, which now terminates with a lump sum payment.
Alois’ entry in the parish baptismal register leaves the name of his father blank.
Maria Schickelgruber subsequently marries a Johann Georg ‘Hikler’ [Hiedler], who later dies before her son, Alois, begins his career as an Austrian customs officer.
1868: Alois ‘Hikler’ [Hiedler] has an illegitimate son.
1876: Alois Hikler/Hiedler’s baptismal-record at Dollersheim, Austria, is amended by the parish priest, at the request of the 77-year-old Nepomuk Hiedler, brother of the now-deceased JG ‘Hikler’ [Hiedler], supported by the ‘testimony’ of his two illiterate associates (of known dubious character) to the effect that Alois’ deceased foster-father, Johann Georg ‘Hikler’/Hiedler, had really been his biological father.
This is done to secure a career advantage for Alois in the Austrian civil service .
1880: Alois ‘Hikler’ [Hiedler] separates from his wife (moneyed and 14-years older than he) and takes the barmaid of the Gasthaus on the ground floor under his apartment/flat as his mistress.
1883: Alois’ first wife dies and he marries his mistress, who had already born him one child and bears another before dying of tuberculosis two years later.
Later, Alois changes his surname to Hitler.
c.1886: Alois marries Klara Pölzl (seventh-child of Nepomuk Hiedler’s daughter Johanna, whose married name was Pölzl), who had worked for Alois as serving-maid before his separation from his first wife. He has six children by Klara (the first being born five months after the marriage, but only two survive their early years - Adolf and Paula).
1889: Saturday, April 20: In Brannau on the river Inn, Adolf is born, the fourth child of Klara.
Well... and that part is just speculation. There is no PROOF of it. So how can you say it's "the truth".