The Potter family was near-perfect, two twin sons, wealth, fame, and a future brighter then the sun... but it hides a secret, while one son the 'older' of the two sons, Charlus, or Charles as his parents called him, was known to have magic, but none had heard anything of the younger, Harry. The reason being very sinister, on that fateful October night, where Godric's Hollow was razed to the ground, there was a choice made, Charlus the supposed 'Boy-Who-Lived' had his core fail after Harry blocked Voldemort's Avada Kedavra. Dumbledore took the two boys, who's parents had then been awakened from their duels with Voldemort, and switched their cores, Harry lost his magic, and Charlus regained his. The switch had been covered up, Harry being said to be a squib, but what if one day, Snape accidently let it slip, not knowing that Harry was eavesdropping? What if he stumbled across the mythical castle of Avalon? What if an old man welcomed him, adopted him? What if that old man...
Was King Arthur Uther Pendragon?
DISCLAIMER!!! The story is not mine. You can find Chapter 1-15 here on Wattpad as well, the author is @ElizabethCochran .
The original Story was written on AO3 by Jessiikaa15 .
Links to the original : https://archiveofourown.org/works/5243351/chapters/12096080
https://m.fanfiction.net/s/8873552/1/Twins-A-Different-Life
SUMMARY FROM AO3:
When Voldemort attacked he didn't kill Lily and James. When he met his downfall they mistook Harry's twin as the GWL, they send their son away to the Dursleys but he doesn't quite make it in to the Dursley's loving care. Harry will take Hogwarts and his 'family' by storm and by the time the 'light' realize their mistake it will be too late for them to fix.
All credits go to Jessiikaa15.