Harry Learns of Dumbledore's Role in Ariana's Death

Harry and Hermione read about the tragic circumstances surrounding Ariana Dumbledore's death. The book suggests that Aberforth Dumbledore blamed Albus for their sister's death, and there is speculation that her death may have been connected to Albus and Gellert Grindelwald's dangerous experiments. The chapter concludes with a description of the brawl at Ariana's funeral, where Aberforth broke Albus's nose.