Honestly, a lot of these fics hit the same beats. He usually overhears a conversation he wasn't meant to, maybe through a forgotten Extendable Ear or because the Burrow's walls are thin. The classic setup is him catching Molly and Arthur discussing something pragmatic, like how his fame and gold are useful for protecting their own family's standing or clearing their name with the Ministry. It's never a loud, dramatic confrontation at first; it's that quiet, sickening realization that clicks everything into place—why they were so quick to take him in, why certain topics are avoided.
Sometimes the betrayal is more passive, framed as them prioritizing the 'greater good' or the Order's plans over Harry himself. They knew Dumbledore's machinations and went along, making him a pawn while selling him the dream of family. The real sting isn't malice, it's the erosion of every warm memory. That Christmas jumper isn't affection anymore, it's a guilt offering. The best ones don't make the Weasleys mustache-twirling villains; they make them flawed people who made a calculative, heartbreaking choice, which hurts way more.
Ron's role is often the pivot. Does he know? If he didn't, does he choose his family over Harry? That friendship fracture is where the real emotional weight lies, more than the gold or the fame.