Yes, it is believed that Hitler's mother's grandfather Johann Nepomuk Hiedler or his brother was also Hitler's father's biological father. Moreover, Johann was also Hitler's father's step-uncle, so was quite a bit of inbreeding and relatedness between them. Even after Hitler's parents were married, his mother, Klara, still called her husband Alois Uncle.
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I have never heard this suggested. The name Adolf was a very popular given name in the period from about 1830-1900. It does not indicate any family link between them.
No, they died from natural causes.
mum= peasant girl dad= minor customs official
They were Roman Catholic.
Yes, see Related Links.
I Think It Was Hitlers Bloody Mess.