PLEASE REMEMBER THIS IS NOT %100 CANNON AND THERE MAY BE SOME MISTAKES IN GRAMMAR. *

My explanation:

William Afton:

William is a murdered to this day, he started killing before he had kids, it was only a way to relieve stress until he found out about remnant. William is Glitchtrap and killed those kids on his own. William was born in 1929 William married Mrs. Afton at the age of 23 (1952) and died at the age of 56. (1985)

Mrs.Afton (Loretta) :

Yes, I know Mrs.Afton isn't Cannon but I like her in my AU, Mrs.A's real name is Loretta. Loretta was born 1927, Mrs.A married William at the age of 22 (1952) and died at the age 42 (1972). Loretta is 2 years younger than William. As I said earlier, William married her at the age of 24. No, she was not killed by William, she accidentally drove of a cliff. Loretta hated William and Micheal but only stayed with him for Elizabeth and Evan (C.C). Once Elizabeth and Evan died she left, but as I said earlier, she accidentally drove off a cliff. Loretta possess Ballora.

Micheal Afton:

Micheal is not named Terrance nor does he have an older brother/twin brother named Terrance. Micheal was born 1956 and died at the age of 36 (1991) under the name of of Eggs Benedict at Sister Location, he had his organs scooped out and can no longer eat, but is somehow still alive. After he set fire to Fnaf2 (Freddy Fazbear Pizza) with Circus baby and other in that fire, he set his own soul free, but the others managed to survived. Micheal lived with Henry after William died. Micheal developed Autophobia (fear of being alone) After the Sister Location incident.

C.C/Crying Child (Evan Afton):

Though C.C has no confirmed name, I like the theory of Evan as his name so that's what I use! Evan was born 1966 and died at the age of 6 (1971) and two years older than Elizabeth. Evan saw Elizabeth death but was froze in shock to help her. Evan got his frontal lobe bitten off by Fredbear (yes I know it was 1993 but this is my AU!) because of an accidental prank his older brother, Micheal, planned with his friends on his 6th birthday. After that, Evan possessed Golden Freddy with Cassidy and became a soul after William burnt down Fnaf1.

Elizabeth Afton:

Elizabeth was born 1968, two years after Evan (C.C). Elizabeth died at the age of 4, being too stubborn to listen to her father and went to Circus Baby. Circus Baby trapped her in her stomach hatch, it slowly suffocated her and starved her. After that, she was missing for 3 months before being pronounced dead without any evidence except for how long she had been missing. Elizabeth possessed Circus Baby and did NOT posses Ennard. She unknowingly killed her brother, who'm she thought was some random guy, she is part of Ennard through one of circus Baby's eyes, but she does not posses him, he just shares him with the rest of the Funtimes.

THATS ALL FOR NOW! I'LL ADD MORE LATER!*