This is my whole FNAF AU Timeline!
Prior to FNAF:
1983-Vincent gets to a drunken rampage after his wife's miscarriage and kills a young girl named Marcia, Marcia later possess the puppet
1985- Alex(FNAF4 Crying Child) and Gary's (Foxy Mask brother) father leaves them leaving them alone and for the next 2 years FNAF4 begins its story
1986-Alex meets Vincent
FNAF4 (June 1987)
-Alex has non-stop nightmares of the nightmare animatronics.
-June 13th, Alex's birthday happens, and Gary and his friends put him in Fredbear's mouth. (The Bite of '87) Alex goes into a coma.
-Vincent gets upset of the whole ordeal, and gets drunk again. A week later, he leads 5 kids into a room (One being his niece; Jenna's daughter) and kills them (5 missing children incident). Marcia sees them and lets the kids possess the animatronics. Due to the incident the place closes.
-2 weeks pass after the two incidents, and Vincent meets Gary again, with Gary apologizing and explaining everything that happened before the incident. Vincent feels remorse and forgives the boy.
-Alex wakes from his coma, and he and his gets adopted by Vincent and his wife Briana. A few days later, Briana gives birth to Vincent's child Victoria.
Between FNAF4 and FNAF2
-A sister location opens, but for a short while after William's daughter, Elizabeth gets killed by Baby
-William meets Jenna and strikes a deal with her
-A month before FNAF 2 (September) Jenna leads 5 more kids (Foxy's Minigame, FNAF4 Minigame Kids) and kills them. The kids possess the toys, and the old animatronics are scrapped away.
FNAF2 (November 1987)
-Jeremy and Fritz are the new workers at the new restaurant. Fritz takes dayshift while Jeremy takes the nightshift.
-After surviving 5 nights and learning the secrets of FNAF, Jeremy and Fritz switch shifts. With Fritz getting fired.
Between FNAF2 and FNAF1
A series of murders committed by Jenna and William happen at other restaurants that are sister locations or rival places of Freddy Fazbear's happen
Alex and his family decide to make a new game for all of them to play using Alex's plush toys. (FNAF World)
Henry the creator of the Fazbear animatronics, and the boss revives Baby and dies. Vincent becomes the new Manager with Scott/Phone Guy being the Assistant Manager at the FNAF1 location
FNAF1 (1992)
A week before Mike Schmidt starts his Scott gets attacked by the FNAF1 animatronics, but survives after being saved by his brother, Vincent. Scott quits his job, leaving Vincent to hire William as his assistant manager
Mike Schmidt starts his job, and after 6 nights of working quits his job.
Before Sister Location (1994)
William and Jenna decides to commit their last sets of murders by killing Vincent and his family. William leads Vincent and his family to The Sister Location, where Jenna is waiting for them
Before Jenna could kill anyone, William feels remorse and kills Jenna by putting her in the scooping room, and later burning her body to hide evidence. William apologizes to Vincent, leaves the Sister Location never to be seen again.
Jenna's spirit possess Ennerd; a animatronic Afton made that TOO out of control.
Sister Location (1995)
William's son; William Michael Afton Jr. (Michael or Mikey by friends) works at Sister Location to get money for award to look for his father.
Jenna/Ennerd destroy the SL animatronics every night Michael works and impersonates Baby's voice
After completing 5 nights, Jenna/Ennerd takes Michael to scooping room, kills him, and go inside him.
A month after, Michael's body becomes Purple, and Ennerd leaves the body, but Jenna possess it controling Michael. Michael's sister Elizabeth comes out and becomes Michael's guide, so Jenna won't hurt him or anyone.
People think Michael is the serial killer back in '87 through '91
(FNAF3 Cutscenes) Michael finds out about Vincent, and thinks he's responsible to his father's disappearance and the true murderer. Michael impersonates Vincent and destroys the FNAF1 animatronics hoping to find the bodies. The spirits of the FNAF1 animatronics (The one's that Vincent killed) reveal themselves to Michael, scaring him and he goes inside Springtrap, crushing him, and killing Jenna's spirit
Vincent finds out about this and shuts down Freddy Fazbear's.
Between FNAF1 and FNAF3
The guards have their own jobs and futures, forgetting about Freddy's.
Vincent's daughter, Victoria and her boyfriend Colton 'Cole' are engaged.
A new owner decides to take Freddy Fazbear's and make it to a haunted house called Fazbear's Fright. The past guards refuse on the offer
FNAF 3 (September 2017)
A week before October, Cole and his cousin Daniel 'Dash' work at Fazbear's Fright. Victoria takes the job as well, but doesn't start working till the actual opening day.
Michael/Springtrap awake from their slumber and Elizabeth makes phantoms for the attraction. Due to him being asleep so long Michael thinks Cole is Vincent.
Cole spends 5 nights at Fazbear's Fright.
One night he brings Victoria over, and Michael/Springtrap attacks.
Victoria explains everything, but before Michael could do anything, a fire starts and Cole and Victoria escape.
Michael now knowing the truth, and is still alive from the fire leaves the burnt down Fright and looks for his father.
The End!

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My FNAF AU
OverigHere is info about my FNAF AU. If you have questions about the characters, ask and I'll be there to anwser.