1.Voldemort, Harry, And Snape Are The Three Brothers And Dumbledore Is Death
This fan theory states that the three characters are the three brothers from the “Tale of Three Brothers” story in Deathly Hallows and that Dumbledore is Death. The story goes that the brothers meet Death on the road. Death offers them their deepest desires in exchange for their souls. The first wishes for a powerful weapon and is given the Elder Wand. The second asks Death to bring back his wife and receives the Resurrection Stone. The third brother cleverly asks for a way to hide from Death and is given the Cloak of Invisibility. Voldemort dies for power, Severus dies for love, and Harry speaks to his old friend, Dumbledore/Death, in the afterlife.
Rowling loves the Dumbledore theory, tweeting, “Dumbledore as death. It’s a beautiful theory and it fits.”
Further, Dumbledore represents all three brothers. When he was young, he sought power. He lost his sister and might have longed to see her again. And he wasn’t afraid to die, greeting it “like an old friend.”
2.Crookshanks Used To Belong To Lily Potter
This one comes from Yedu Krishnan who says that when Hermione buys the cat at Magical Menagerie, the owner says they’ve had the cat for “quite some time.” Harry often wondered if their cat survived the attack by Voldemort when he was a baby.
So when Crookshanks recognizes Scabbers/Wormtail and Sirius in their animagus forms, it’s a strong clue that Crookshanks was Harry’s family cat.
3.Harry and Sirius are related by blood.
Within the wizarding world, Harry enjoys a particular sort of social privilege: not only is he The Boy Who Lived, he is also the son of James Potter, of the pure-blood Potter family. Due to his Muggle upbringing, Harry pays little notice to his own blood status, let alone anyone else’s. However, wizarding genealogy indicates that the son of Muggle-born Lily Evans and nephew of decidedly unmagical Petunia may belong to an ancestral chain that goes back generations into pure-blood history. Though Rowling mentions James Potter’s parents only in passing as a wealthy couple who had a child quite late in life, some clever fans have connected the dots and think they might know exactly who Mr. and Mrs. Potter are.
The Noble and Most Ancient House of Black exemplifies the most rabid sort of pure-blood family, the kind which kept an elaborate family tree of their exclusively magical lineage dating back to the Middle Ages, and disowned any sons or daughters considered to be “blood traitors.” With their family motto of Toujours pur (“Always/Still pure”), the Blacks took cruel pride in burning off the names of such blood traitors from their family tree, preferring singed holes in the tapestry to acknowledgment of any impurity. Just as the tree links the Black family to the Malfoys, the Weasleys, the Prewetts, and other pure-blood families by marriage, it may also provide a link to Harry Potter himself, by way of Dorea Black’s marriage to Charlus Potter. These two, fans believe, are none other than James Potter’s elderly parents—Harry Potter’s grandparents.
Secondary to this is the possibility that Charlus and Dorea’s unnamed son was James’s father, thereby making Dorea Black Harry’s great-grandmother. Either of these possibilities suggest direct familial relationships between Harry and many of his loved ones: his wife Ginny may be his third cousin; his godfather Sirius his second cousin, twice removed; and Arthur Weasley, Andromeda Tonks, Bellatrix Lestrange, and Draco Malfoy various other forms of cousins. The third possibility is that Charlus Potter was a more distant relative of James Potter, leaving Harry as unentangled with the Noble House of Black as before—but without additional canonical information, each option is as likely as the next.