Imagine this. Harry potter has a twin sister called Eliza who also survived the clutches of lord Voldemort. When harry was sent to live with the dursley's she couldn't because Dudley had nearly killed her 3 months before. Unsure what to do the young girl is raised by Dumbledore in school terms and lives at the burrow during the holidays but when she turns 12 she'll be in for the biggest step in her life.