Harry Potter au, where after the war, both Regulus and Remus become teachers, Regulus instead of Snape (not movie snape, creepy book snape) and Remus as the defense against the dark arts teacher. You can even keep the steady stream of weird one off teachers as the divination, muggle studies, and astrology teachers because I've always found it weird that only Harry's year got different teachers for those classes.
Harry does NOT stay with the Dursley's AT ALL
Lockhart honestly forgot he was supposed to be teaching something else and releases pixies on them anyways.
When Dumbledore's army happened, Umbridge breaks down the door just as Remus comes running down the hallway, shouting something about sanctioned club activities with Regulus and Minerva right behind him
Regulus is furious about Quirell
Minerva and Regulus bitch about Trewlany so much
Poppy plays her best at "I'm just the school nurse" but the worried grandmother she actually is thrives whenever she can find Minnie, all of the kids (Rem & Reggie(Siri too)) and grandkids (Harry Inc +)
Where Crabbe and Golye are treated nicer
Where Malfoy, Blaise and Pansy aren't villianised
Where Neville and Luna aren't shoved aside
Also, consider when Remus finds both Padfoot and Wormtail on the map near the kids:
Remus *shaking Regulus*: UP KIDS ARE IN DANGER
Regulus *shooting upright in bed*: WHY IS IT ALWAYS THEM
