Yuuuup.
Fiend warlock player did not like learning how I used his minor backstory. (He actually loved it.)
He knew he needed to save a tree. He didn’t know he was the one to burn it, nor that he did so because it was a source of power to his mother, who was a night hag.
So much fun.
He saved the tree and even managed to change his Patron, but is too scared to confront his mother again.
The DM then sits back and eats pizza as they put his furniture together.