Voldemort attack but Lily and James are still alive with their two kids; Garrison (Gary) Potter, the boy-who-lived their birth son and Hadrian (Harry) Potter their adopted boy. The boys don't know they're not twins but one of them suspects such and now they are going to start at Hogwarts. Evil Dumbledore, Good Voldemort
Harry didn't know how much he was being used but all that changes when he asks Neville for help instead of his so called friends. Very Gritty, first chapter shows the extent of Harry's abuse, only referenced after. Pairings Draco x Harry, Neville x Blaise, OC x Victor. Don't Read If Squeamish!
Dumbledore has ruined many lives to stay in power and keep living but he forgot one thing important about Squibs. Some of them become immune to Mind Magic if used to often. That's what happened, Petunia Evans ... now a Dursley not by choice, with a child that isn't even hers. She's remembering things and no longer will she let herself or her Nephew Harry be abused any longer.