It had never occur to him that she was anything but completely correct
“He did have the family he deserved. They were wonderful, truly wonderful, and he knew it. And what’s more, he did deserve them.
“There’s my brilliant boy,” Yvette would call out whenever he walked into the house.
It had never had to occur to him that she was anything but completely correct.”
I can probably get the ideas is a that: she was anything but complete correct" means that she is God, here "she" is "he"s grandmother.
So why we use the "but" rather than "and".
Maybe here is my stereotype:______ he is good at study, but sometime do some bad thing", my preception is that: "but"___always toward to some things opposite the previous mentioned.
Here I think "and" maybe more appropriate.
MAYBE: I misunderstood d the last sentence.