The Weasleys are known for not supporting the notion of blood purity. They were considered one the biggest "blood traitor" families within the wizarding world of Great Britain. They willingly associated with Muggles, Muggle-borns, and other "blood traitors".
Why did Snape betray the Order during the battle of the seven Potters? - Quora. So although I don't ever really defend Snape, in this instance… Snape was instructed by Dumbledore to give Voldemort the true departure plan for Harry - except for omitting that there would be seven Harry Potters.
If you look up the word "traitor" in the dictionary, Peter Pettigrew's face will most likely appear right next to it. This man is known for his cowardly actions considering he betrayed Harry Potter not once, but several times throughout his life.
Marietta becomes an informant and betrays the group to Umbridge when Umbridge threatens her mother's job, which is not without consequences: the parchment that all the members signed back at The Hog's Head at the first meeting was jinxed by Hermione, causing anyone breaking the oath to have purple pustules spelling the ...
However, they all learned the truth in 1994, when Pettigrew was exposed by Sirius Black and Remus Lupin; "Scabbers" was, in fact, Peter Pettigrew, the wizard who betrayed James and Lily Potter to Lord Voldemort.
This betrayal had the biggest damage in the series as it made Harry an orphan, sealed Sirius in Azkaban for twelve years, and led to all the deaths shown in the future when the Wizarding War resumed.
Peter Pettigrew, the Secret Keeper for the Potter family who betrayed them to Voldemort. Sirius Black was originally meant to be the secret keeper for James and Lily Potter, but Sirius thought Voldemort was on to him (he thought that Remus Lupin was a spy), therefore passing on the Secret Keeper to Peter Pettigrew.
Lord Voldemort and his Death Eaters targeted blood traitors during the First and Second Wizarding Wars because they opposed their goals. When they were temporarily in control of the Ministry of Magic in late 1997 and early 1998, they kept blood traitors such as Arthur Weasley under surveillance.
If you have only seen the films, you might be surprised to hear that it wasn't Cho Chang who betrayed Dumbledore's Army to Professor Umbridge – it was Marietta Edgecombe. A friend of Cho's and a fellow Ravenclaw, Marietta (reluctantly) joined the DA.
Marietta was described as having curly, reddish-blonde hair. After she was struck with the parchment jinx for betraying the D.A., she bore pimples spelling "SNEAK" across her face.
The Weasley family is one of the few remaining pure blood wizarding families, though they were considered "blood traitors" for associating with non-pure-bloods.
Gryffindor and Slytherin - this is not the good and bad house. Gryffindors can be brash/reckless and ego-centric, as well as short tempered. Slytherins ALSO think they are the best, and they are ambitious and productive. The Gryffindors think Slytherins aren't noble, which doesn't help.
Although Peter is not "the dark lord" himself, he drives home the point that evil would be nothing without its supporters, making Pettigrew as bad as it gets.
Hedwig's killer is not explicitly identified, so he/she may have appeared in other books, films or video games, but the only known appearance is Harry Potter and the Deathly Hallows and Harry Potter and the Deathly Hallows: Part 1. A popular fan theory based on book canon suggests that Snape may have killed Hedwig.
Mundungus' betrayal caught Moody by surprise and gave Voldemort enough time to cast the Avada Kedavra and kill Mad-Eye Moody. After he was brutally killed by Lord Voldemort, Moody's dead body tragically fell from his broom.
Fred was killed in an explosion possibly caused by Augustus Rookwood. One of the last things Fred heard before dying was Percy joking about resigning from the Ministry. Percy wouldn't leave Fred's side until Harry and Ron helped him move the body to somewhere safer, coincidentally behind a suit of armor.
Their relationship grew stronger after the death of Cedric Diggory, but Harry suspected Cho of betraying their secret student group. Cho's lingering feelings for Cedric and a lack of chemistry between her and Harry contributed to their breakup, leading to Harry ultimately ending up with Ginny Weasley.
Antonin Dolohov used the curse twice during the Battle of the Department of Mysteries, first against Hermione Granger, who was knocked unconscious but survived.
Interestingly, despite Harry being the leader of the Trio, he is actually the youngest of the three, whereas Hermione is the oldest and Ron is the second oldest.
Due to his humiliation in the Triwizard Tournament, Cedric eventually becomes a Death Eater and kills Neville Longbottom. Due to Neville's death, the final Horcrux Nagini was never destroyed, and as a result Voldemort is never defeated, kills Harry and takes over the Wizarding World.
Arthur Weasley was originally intended to die in either the fifth or seventh book (particularly when Nagini attacked him), but J. K. Rowling decided against it, because he was "one of the few good fathers in the series." Remus Lupin and Nymphadora Tonks, two other good parents, were killed off to compensate for this.
Percy proved himself to be very much of a social climber. He wanted to achieve prominence at the Ministry, choosing to dedicate himself to the institution and abandoning his family when they chose to rebel against the Ministry.
The last known surviving bearer of the family name, Sirius, is murdered by his cousin Bellatrix Lestrange in Harry Potter and the Order of the Phoenix.
The silver hand Lord Voldemort had given Pettigrew interpreted his hesitation as weakness and/or disloyalty, and strangled him to death, saving Harry and finally finding redemption for his treason, despite his reputation remained tarnished as many remained dubious of the evidence of his innate bravery.
Sirius Was Supposed To Be The Potters' Secret Keeper (But He Secretly Switched) Just as the Harry Potter movies didn't explain why Peter Pettigrew betrayed the Potters, they never revealed precisely how he did it.
