Alois Hitler
Alois Hitler, Sr. was an Austrian civil servant and the father of dictator Adolf Hitler.
Alois Schicklgruber was born in the hamlet of Strones, parish of Dllersheim, in the Waldviertel, an area in northwest Lower Austria, to a 42yearold unmarried peasant, Maria Schicklgruber, whose family had lived in the area for generations. At his baptism in Dllersheim, the space for his fathers name on the baptismal certificate was left blank and the priest wrote illegitimate. His mother cared for Alois in a house she shared with her elderly father, Johannes Schicklgruber.
Source: Wikipedia