Johann Georg Hiedler (28 February 1792 – 9 February 1857) was a journeyman miller who was officially considered to be the paternal grandfather of Adolf Hitler by Nazi Germany. However, whether Hiedler was in fact Hitler's biological paternal grandfather remains disputed by modern historians.
Alois was the illegitimate son of Maria Schicklgruber, who had married Johann's older brother, Johann Georg Hiedler on 10 May 1842, who may in fact have been Alois' natural father. Alois would claim in his later life that Johann Georg Hiedler was not his stepfather, but in fact his biological father, since Johann Nepomuk informally adopted Alois during Alois' childhood.
Accordingly, Johann Georg Hiedler is often cited as having possibly been the biological grandfather of Adolf Hitler. Although Alois was legitimized and Johann Georg Hiedler was considered the officially accepted paternal grandfather of Hitler by the Third Reich, whether he was Hitler's biological grandfather remains unknown, which has caused speculation.
En 1877, 20 años después de la muerte de Johann Georg y casi 30 años después de la muerte de María, Alois fue declarado legalmente hijo de Johann Georg. En consecuencia, Johann Georg Hiedler es una de las tres personas más citadas por los historiadores modernos por haber sido posiblemente el abuelo paterno real de Adolf Hitler.
Sometime later, a man named Johann Georg Hiedler moved in with the Schicklgrubers. He married Maria when Alois was five, and Maria died when Alois was nine. By the age of 10, Alois had been sent to live with Johann Georg Hiedler's younger brother, Johann Nepomuk Hiedler, who owned a farm in the nearby village of Spital (south of Weitra).
In 1842, Johann Georg Hiedler married Alois's mother. Alois was brought up in the family of Hiedler's brother, Johann Nepomuk Hiedler. In 1876, Alois was made legitimate and his baptismal record annotated by a priest to register Johann Georg Hiedler as Alois's father (recorded as "Georg Hitler").
Johann-Georg Hiedler llevaba veinte años enterrado y la madre treinta, pero el cura accedió. Al año siguiente de su legitimación, Alois cambió su apellido Hiedler, de origen checo, por el de Hitler, de grafía similar a su fonética.