The book introduces his parents, Percival and Kendra Dumbledore, as well as his little sister, Ariana; his brother, Aberforth Dumbledore, was mentioned in previous books.
As far as we know, Albus Dumbledore only has one brother and one sister. His brother, Aberforth, appears in Harry Potter and the Deathly Hallows.
There were plenty of unanswered questions about the Dumbledore family at the end of the previous "Fantastic Beasts" film, "The Crimes of Grindelwald." After Grindelwald told Credence Barebone that he was Aurelius Dumbledore, the brother of Albus Dumbledore, fans were left confused as a result of the sudden reveal.
Albus confirms to Creedence early on in the film that he is in fact a Dumbledore, quashing any rumor that Grindelwald had lied to the young boy in order to sway him to his movement. It is explained that Credence is the illegitimate son of Albus's younger brother, Aberforth (Richard Coyle).
As we know from the Harry Potter series, Dumbledore had two younger siblings who were known to the public, his brother Aberforth and sister Ariana.
Kendra Dumbledore
Not only did her husband end up being incarcerated in Azkaban, but the whole family had to move from Mould-On-The-Wold, to Godric's Hollow to try and protect her youngest.
Grindelwald knew Credence was Aurelius Dumbledore from the moment he realized Credence was an Obscurial (much like Ariana Dumbledore), and that he had survived the Obscurus for so long (which meant that he came from a very powerful wizard bloodline).
Credence Barebone Isn't Voldemort's Dad But He Could Be Snape's Grandfather.
Credence may well be related to Voldemort, but it would have to be through Voldemort's grandmother. That also means the mystery woman must've had a second child: Merope Gaunt, born in 1907. It's entirely possible that Aberforth could have sired a child with Voldemort's grandmother.
He is the antihero with a tragic past and noble intentions - and Aberforth just confirmed it. Fantastic Beasts: The Secrets of Dumbledore confirmed that Credence Barebone/Aurelius Dumbledore (Ezra Miller) is the new Snape (Alan Rickman) through a very familiar line delivered by Aberforth Dumbledore (Richard Coyle).
Fantastic Beasts: The Secrets of Dumbledore finally revealed that Credence (Ezra Miller) is Aberforth Dumbledore's (Richard Coyle) long-lost son, but his mother could very well be a Gaunt, making Credence related to Voldemort (Ralph Fiennes).
We learnt who Credence really is
However, that wasn't entirely true. While Credence is a Dumbledore, he isn't the brother of Albus, Aberforth and Ariana. In fact, he's Aberforth's secret son! Aberforth met Credence's mother the same summer that Albus and Grindelwald met.
Without anyone's knowledge, except Newt, Credence turned out to have survived, because an Obscurial could not be killed while in their Obscurus state. Credence, as a single shred, fled away from the subway station to the destroyed Second Salem Church.
Voldemort, Snape, and Harry Are The Three Brothers – And Dumbledore Is Death. A popular fan theory explains that these characters are modern allegories to the Peverell brothers based on their motivations and goals. Voldemort represents the older brother, aka Antioch Peverell, said to have crafted the Elder Wand.
Harry Potter, a living descendant of the third brother was later given the cloak by Albus Dumbledore. Long ago, it is said, Death created the Deathly Hallows. The Elder Wand; The Resurrection Stone; and The Cloak of Invisibility, together, make the beholder a master of death.
The Three Brothers
Each possessed one of the Deathly Hallows: Antioch: the Elder Wand. Cadmus: the Resurrection Stone. Ignotus: the Cloak of Invisibility.
As the most mysterious character introduced in Fantastic Beasts, Credence has been the subject of many fan theories, the most prominent of which is that Credence is related to Voldemort. One particularly popular theory is that Credence is really Tom Riddle Sr., Voldemort's father.
When promotional material for Fantastic Beasts: The Crimes of Grindelwald was released, it was believed Credence and Nagini would be a couple due to how closely together they were. After the release of the film, it is still speculated that the two have feelings for each other that they never revealed.
Severus' lineage on his mother's side was Irish. His maternal grandparents, Muireann Prince and her husband, Roderick, were overjoyed when their daughter had a son. His middle name, Gaeilge for 'Dark Warrior,' was gifted at birth by Roderick when he held him for the first time.
Snape was Dumbledore's man from the moment Lily was murdered. Over the years he did whatever he could to try to make up for his past as a Death Eater, and he followed Dumbledore – for the most part – without question. But when the headmaster of Hogwarts revealed Harry's true fate, Snape's reaction was not unlike ours.
They are from different families. Though Queenie might be related to Anthony Goldstein. Yeah, there are some similarities between them like they both were half blood and what u said but they are not related in any way. Also, Queenie was a naturally born legillimen while Snape had acquired that skill.
Arabella Lily Snape (born 12 June 1981) was a half-blood witch and was the only daughter of Professor Severus Snape and an unknown descendant of Slytherin. She attended Hogwarts from 1992 until her death in 1998.
It's thus unlikely Aberforth would open up about Credence without being prompted to. Since Harry doesn't know Aberforth had a son and Albus doesn't find it relevant for Harry in the context of the Second Wizarding War, it makes sense neither brother mentions Credence in the Harry Potter series.
Grindelwald later orders Credence to murder his uncle Albus Dumbledore in Berlin, claiming that the Dumbledores knowingly abandoned him. Credence stalks Dumbledore through the streets before confronting him, and the two duel.
Harry Potter, Ron Weasley, and Hermione Granger learn about Grindelwald by accident. At Bill and Fleur's wedding in "Deathly Hallows," Xenophilius Lovegood wears a necklace with the Deathly Hallows symbol on it.