Credence's date of birth
In the first Fantastic Beasts movie, Credence is still living with his
adopted mother and Ezra Miller, who plays him, once reportedly said
that Credence was 18 years old in an interview.
But let's be generous, say Ezra was mistaken, and assume Credence was
actually in his twenties. If Credence and Albus share the same mother,
this is still pretty much implausible.
In Harry Potter and the Deathly Hallows, it is revealed that Albus'
mother Kendra was killed by his little sister, Ariana, in 1899. Had
Kendra given birth to the baby none of us had ever heard of before her
death, that means that Credence would be 28 years of age at the very
least during the events of Fantastic Beasts, which is set in 1926.
What's more, since Leta and Newt were born in 1897, this means that
they would have been just two years older than Credence if he was born
before Kendra's death.
But what if Credence was born after Kendra's supposed death date?
Harry Potter's Wiki lists Credence as being born in 1901, the same
year as the boat journey to New York, which of course means that in
all likelihood Kendra is NOT Aurelius' mother.
The only way that this could be plausible is if she faked her death
then had baby Aurelius two years later. But Kendra had a troubled
daughter that she never would have left, especially after spending
years fiercely protecting her, and was even buried with her child in
What if Aurelius shared the same father as Albus instead?
The alternative suggestion would be that Albus' father Percival had
another child with someone else, years after Kendra's death. It is
also fairly impossible since Percival is known to have died in Azkaban
after being imprisoned there in 1891.
Even if we were to suggest that he escaped the prison, this is
incredibly unlikely for two reasons. Firstly, Sirius was famously the
first prisoner who ever knowingly escaped Azkaban and, secondly, the
only other person to escape was Barty Crouch Jr, who swapped places
with his mother using Polyjuice Potion.
It is also strongly implicated that Credence's adoptive mother, Mary
Lou Barebone, knew something about Credence's birth mother, calling
her a "wicked, unnatural woman" in the first Fantastic Beasts
The life and lies of the Dumbledore family
Another reason that the huge revelation makes very little sense is
that a fourth Dumbledore sibling isn't even alluded to in the Harry
Potter series. Of course, this would all make sense if Albus and
Aberforth didn't have a clue that they had a second brother since we
hear all about the family's history from their perspectives.
However, The Crimes of Grindelwald seems to insinuate that Albus – and
indeed his old friend Grindelwald – were well aware of Credence's
heritage, so much so that the plot of the sequel centers on the pair
trying to bring Credence to their side before the other one gets a
So why on earth did this never come up when Dumbledore is an old man
in the Harry Potter series? Why did Rita Skeeter not even uncover it
for her tell-all book? Why did Aberforth neglect to mention a younger
brother while filling in Harry, Ron, and Hermione on his family's
Aurelius also isn't included when JK Rowling revealed what Dumbledore
saw when looking into the Mirror of Erised, although every other
family member is. Speaking on a Leaky Cauldron web chat, she said:
"[Albus] saw his family alive, whole and happy – Ariana, Percival and
Kendra all returned to him, and Aberforth reconciled to him."
Since the film strongly hints that Credence really is a Dumbledore,
why doesn't Albus see him as a true member of his family? Could
Grindelwald be lying and somehow have planted the phoenix that
confirmed Credence's true identity? What is the truth?!
So, in short, it makes no sense, for now, all hypothesis are going dead end. So it's either Grindelwald is lying or soemthing esle is going on we didn't know before.