Curate, connect, and discover
Percy, Penelope and Oliver are the epicenters, once they turned 13 their memories returned
Each of the kids got their memories back at 13 except for Bill and Charlie, who only get memories back through doing things again like deja vu except way more clearly. This is because Bill and Charlie are older than Percy and because of the cursed vaults somehow
Harry and Hermione are able to get their memories back despite not being related to the Weasleys (though technically Harry is very distantly related) because they are soul connected/bound to Ron.
How this happened idk but it did, so instead of them getting their memories at different times they all get them when Harry turns 13, as he is the youngest out of the three
Percy has a way of communicating with Penelope and Oliver that’s not mail, its a message book, set up like a message board and until all children are 13 its just the three of them
It was a spell gone wrong, Penelope was trying to transfigure a Time Turner using a form of alchemy she had found in an untouched section of the ministry library, using Percy and Oliver as anchors, however it backfired and caused the three to wake up on their 13th birthdays
Percy beforehand could sort of see magic and afterwards so can Penelope and Oliver, just much fainter, because of this Percy knew that it wasn't just them three when the twins turned 13, as he assumed the weird hand markings on Bill and Charlie were unrelated and most likely caused by the vaults, which is not entirely wrong
Each person that came back has a hand marking, its like swirls with the alchemy circle that was used in the center, its not visible to those who are not very sensitive to certain magic, alchemy being one of the ones Percy is pretty sensitive too
It was only three months post war, Fred did survive but was severely injured which had slightly carried over, George can also feel the pain that Fred can and vice versa but its severely dimmed
Percy was able to circumvent most of the insanity that was his third year (his roommate Adams was absolutely mauled and killed by his other roommate Nei and Percy was the one who found the scene after in their dorm, Percy was stabbed in the heart by murderous roommate after being super manipulated by him which was kinda stockholmish considering Percy did like like him) however Adams still died and Nei was still pretty insane, at least this time Percy didn't get stabbed, though the residual pain did carry over just significantly less, and hey this time he didn't completely pull away from everybody he loved and cared for in fear of them getting killed or him having to deal with emotions, he chose therapy this time
Charlie was more around during his last two years, he wasn't as sensitive to alchemy as Percy but he could still tell something was up, a lot was happening differently though he didn't know why it was different, it wasn’t until his last year that he realized that it probably had something to do with the vaults and told Bill about it, who was in training to be a curse breaker but seemed to already know pretty much everything loosely
The twins are connected, not soul bound/connected like the GT, proper connected, they can share thoughts feel each others pain (though only lightly) and their emotions (the more focused they are the more they can feel), this seemed amplified when they turned 13 and got their memories, the two rarely left each other's side, more attached than before, the heightened connection also allowed them to get an idea where the other was
Ginny was the most obvious about it, simply just pulling Percy aside and demanding an explanation because “This is something only you would have a hand in, not even the twins are this chaotic I swear”, she wondered if Luna would also remember despite her not having any relations to the Weasleys but considering its Luna anything was possible. Luna didn’t remember but did have something similar to the deja vu effect Bill and Charlie had, just a lot less, but since its Luna she didn’t need to have it as strong to know as much as she did
The soul connection between Harry, Hermione and Ron allows them to have a vague idea where each other are, have short thoughts sent to each other with training, have semi shared mannerisms (it's not strong or obvious), and feel each other's emotions, not that they know any of this beforehand. The bond was created during the horcrux hunt however since everything was strung so high none of them noticed anything was off, even after the war they just thought it was the bond of besties who literally killed and fought for each other and not some weird literal soul bond/connection, however everything is made extremely more obvious once Harry turned 13 and all three got their memories back (All the Weasleys were concerned as to why Ron just kinda started having a panic attack in the middle of the night, Hermione was much calmer because of her proximity to Harry but not by much truly, and Harry was a mess but what's new)
Bill had known something when he turned 13, he wasn’t sure what but something was different, he had an easier time with school and wanted to become a curse breaker despite not even knowing what it was. When he got more and more involved with the vaults he knew how to deal with them, knew just the right steps, when he had begun his training as a curse breaker he understood more. There was a curse on him, a time curse however it was scuffed and very broken, when Charlie came and talked to him about the weirdness Bill noticed that there was a strange marking on Charlie's hand, as a curse breaker he had to be able to see magic and his numerous charms and wards (I know theres like a proper term for little charms that are physical and stuff I just cant remember) helped with that
The twins doubt this timey wimey bullshit and while they weren't wrong, they were hit over the head for it
Year three for the GT happens similarly enough, the difference being Harry talks to Remus about his parents and Sirius more and completely hands peter over to Sirius when asked, he does still somehow manage to escape but this time the GT work on getting Sirius a trial with the help of Penelope (their lawyer when the time comes is Lady Zambini or whatever her proper title would be, fanfics have made me love this woman)
Voldy does still come back BUT Cedric doesn’t die, Percy and Penelope figured out a way to return vague memories to people like how it is with Luna but forced, problem is they gotta be 13 when it happens, so while Tonks would be in the know without the know, Cedric would be in the know with the know. The only way to do this is to alchemy their way through it, Penelope as the caster and Percy and Oliver once again as the anchors, otherwise it wont work at all
By the time Voldy is back, most of the horcruxes had been found but not destroyed as most of the information was with the GT, the destruction process goes well enough yada yada
As each got their memories, they barely acted like the kids they physically were which makes sense, however since they knew things would be better they relaxed, acted their physical age or younger, didn't care at all what people thought because goddamn it their childhood was stolen sue them for wanting it now, especially GT and Ginny, Percy and Co rarely did act their physical age and yet nothing was different because they were always like that
Bada bing bada boom whole AU, its pretty silly and dumb lolz, kinda all over the place if you think about it, probs more to be added, ciao adios Im done