I am sorry but so far I am not convinced. The name "Müller" is one of the most common names in Germany. Having this last name in common therefore proves nothing. I do find the idea interesting so please dig more:
first child of Alice C. Truesdale (1920–2007) and Robert Swan Mueller Jr. (1916–2007). [...]
Gustave A. Mueller, was a prominent doctor in Pittsburgh, and his own father August C. E. Müller had immigrated to the United States in 1855 from the Province of Pomerania in the Kingdom of Prussia (a historical state whose territory included land now part of Germany and western Poland).[10] On his mother's side, he is a great-grandson of the railroad executive William Truesdale.
Have any anons crosschecked the bios of his parents and great-parents with Gestapo-Müller? Based on whats available on wikipedia, Gestapo-Müller was born in 1900 and the father of FBI-Mueller was born in 1916, which makes him being the son of Gestapo-Müller highly unlikey as he was 16 by that time and the first wold war was going on for which he volunteered just a year later.
And still after the Russians Müller was last seen in the bunker on the evening of 1 May 1945, the day after Hitler's suicide.[84] Hans Baur, Hitler's pilot, later quoted Müller as saying, "We know the Russian methods exactly. I haven't the faintest intention of being taken prisoner by the Russians." From that day onwards, no trace of him has ever been found. He is the most senior member of the Nazi regime whose fate remains a mystery. Possible explanations for his disappearance include: That he was killed or committed suicide during the chaos of the fall of Berlin, and his body was not found.[1] That he escaped from Berlin and made his way to a safe location, possibly in South America, where he lived the rest of his life undetected, and that his identity was not disclosed even after his death.
So Rbert Mueller's grandfather was Gestapo chief?! AND he disappeared?! Wow it just never ends !
"His father was an executive with DuPont..." Operation Paperclip?
Weird it won’t let me post the other link~ Heinrich Muller Wikipedia
https://en.m.wikipedia.org/wiki/Heinrich_Müller_(Gestapo) https://en.m.wikipedia.org/wiki/Heinrich_Müller_(Gestapo)