After finally being given a wand by his new master at Nurmengard Castle, Credence accepted his true heritage as Aurelius Dumbledore, and seemingly agreed to help Grindelwald bypass the blood pact and kill Albus Dumbledore.

Is Credence really Dumbledore's brother?

Credence, it's implied, survives the first Fantastic Beasts film by secretly sneaking away from the scene of his presumed death. ... In the final moments of the new film, Grindelwald reveals a crucial secret to Credence: Credence is the long-lost younger brother of Albus Dumbledore himself — and his real name is Aurelius.

Is Aurelius really a Dumbledore?

4 He's Actually Dumbledore's Son

Dumbledore's father was in prison during the time that he would've needed to conceive Aurelius, and not long after Percival Dumbledore went to prison, his wife died. ... Aurelius isn't Dumbledore's brother at all, but his son.