After utilizing Queenie’s telepathic powers to further manipulate Ezra Miller’s troubled young character, Grindelwald reveals that Credence is actually named Aurelius Dumbledore.
Of course, the most drastic change made to Harry Potter lore came in the final moments of The Crimes of Grindelwald.
After Queenie and Credence joined Grindelwald’s villainous army, the latter character’s origin was finally explained.
AKA he’s Dumbledore’s brother, and the fourth sibling in the family.