Potter twins and the philosopher's stone (book one)

when letters arrive for unhappy but ordinary Harry Potter and Lillian Potter, a decade-old secret is revealed to them. Their parents were wizards, killed by a Dark Lord's curse when Harry and Lillian was a baby, and which he somehow survived. Escaping from their unbearable Muggle guardians to Hogwarts, a wizarding school brimming with ghosts and enchantments, Harry and Lillian stumbles into a sinister adventure when he finds a three-headed dog guarding a room on the third floor. Then he heard of a missing stone with astonishing powers which could be valuable, dangerous, or both.

based on the book i dont own the plot and any of the characters besides Lillian.