Question: so how is credence related to dumbledore?
Answer: The baby who she accidentally saved in his place was a secret Dumbledore. According to Grindelwald, Credence is actually the long-lost younger brother of Albus, and his name is Aurelius Dumbledore. ... After all, Dumbledore is nearly 50 in this film. (He was born in 1881, it's 1927, so he's 46.)