<P> Both boys are bullied by other students over the next few years, Albus due to his perceived failure to live up to his parents, Scorpius due to unproven rumours that he is the son of Lord Voldemort . In addition, Albus and Harry begin to drift apart, owing to Albus's struggles with his father's shadow and Harry's uncertainty on how to deal with his son's issues . Albus also drifts apart from Rose, with whom he was friends before meeting Scorpius and was sorted into Gryffindor . Prior to Albus and Scorpius's fourth year, Albus gets into a fight with his father after he is given Harry's baby blanket and a love potion from Ron . During the fight, Harry accidentally says that he sometimes wishes Albus was not his son, and Albus spills the potion on the blanket . </P> <P> Harry obtains a prototype of a more powerful version of the Time - Turner, built by a Slytherin contemporary of Harry's, Theodore Nott, that allows one to travel back several years into the past and change history . Simultaneously, Harry's scar begins to hurt again, causing him to become concerned that Voldemort may somehow be returning . Amos Diggory, who has become old and is cared for by his niece, Delphi Diggory, asks Harry to use the Time - Turner to prevent the death of his son, Cedric Diggory . After overhearing Harry refuse to help the Diggorys, Albus is inspired to do so himself and convinces Scorpius to help him . The two escape from the Hogwarts Express and the trolley operator, who is revealed to be a monster placed on the train to prevent students from escaping . The two arrive at St. Oswald's Home for Old Witches and Wizards in Yorkshire, where Amos lives, and team up with Delphi to steal the Time - Turner from Hermione's office, in the Ministry of Magic, while disguised with Polyjuice Potion . </P> <P> Knowing that Cedric's death was the result of him winning the Triwizard Tournament alongside Harry, the boys use the Time - Turner to travel back to the first challenge of the Triwizard Tournament in 1994 and sabotage Cedric during the tournament's first task in the hope of preventing his victory . Instead, they only succeed in creating an alternate reality in which Ron and Hermione never married, and thus Rose was never born, and Albus was sorted into Gryffindor . Albus discovers that this was because they chose to disguise themselves as Durmstrang students, causing Hermione to become suspicious of Viktor Krum and go to the Yule Ball with Ron instead of Viktor . As a result, Ron never experienced the jealousy fundamental to his relationship with Hermione, fell in love with Padma Patil at the Ball, and eventually became married to her, having a son named Panju . Hermione, in turn, became a frustrated and mean professor at Hogwarts, teaching Defense Against the Dark Arts . </P> <P> At around the same time, Harry's fear that Voldemort may return increases as his scar continues to hurt and as he has Voldemort - related nightmares . After speaking with a portrait of Dumbledore, and being told by centaur Bane that a "dark cloud" is around Albus, he becomes convinced that Scorpius is a threat to Albus and tries to have the boys kept apart at Hogwarts by forcing a reluctant Minerva McGonagall, now Headmistress of Hogwarts, to keep tabs on Albus using the Marauder's Map, threatening to shut down the school otherwise . </P>

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