Hitler’s not exactly the type to bring to mind a father figure image, though he did like to hear himself called “mein Fuhrer” and gave out marital counseling advice and liked to matchmake. He did pose with various real little girls in Germany in the 30’s, but most people think of that as political posturing.
In my novel he kidnaps a little girl from England and then proceeds to convert her to his way of thinking. Thomasina actually likes “mein Vati”. And before that she calls him “Opa”, or grandfather in German. In fact, it’s the first word that Dora and Edward, her biological parents, ever hear her speak.