#freddy fazbear's pizzeria but I could be misremembering as I only saw the movie in the theaters a day ago

[doofnoof]

Okay so I have a theory.

I think Vanessa, Mike, and Garrett are Aftons. Their mom divorced William and took the kids but due to a traumatic event William blackmailed Vanessa into lying and saying she wanted to stay with William instead of her mom. I also think Vanessa may have accidentally killed Garrett, and William covered it up for her and used it to keep her loyal and obedient.

I don't think she knew Mike was her brother until that last scene where she's bandaging him and he asks her to save Abby with him, but she was definitely starting to figure it out by the time she throws his meds away. Her reaction to Abby being in danger is an intense one, because of the trauma she went through as a child for certain, but what if she knows Abby is her little sister? What if she reacted that way because she already lost her little brother, remembers him dying, and now she has the chance to protect her little sister from a similar fate?

I think she knows that William is capable of messing with their memories, and that's why she tells Mike that the dreaming thing doesn't work/isn't helpful, because she's seen first hand how he can change things to be different than what they really were. For instance, there was a yellow frisbee in the park mentioned again and again, as well as a scene where too much ketchup is put on a hamburger. I think Mike actually saw Vanessa killing Garrett and William changed his memories so he only saw Garrett being taken, not the actual incriminating act of William disposing of his body, nor of Vanessa actually accidentally killing Garrett.

I think they were all together having a fun day out as a family, with Mrs. Afton pregnant with Abby, and while playing Vanessa (or maybe even Mike) accidentally killed Garrett, and William came to see what happened when they didn't come eat when they were called. William saw what happened, realized this would look really bad, and possibly threaten his already shakey marriage with his wife, and decided to dispose of the body, maybe even teaching the kids how to do so along the way. Perhaps he even took Vanessa with him and left Michael to watch him drive away. Once he was done, he messed with their memories so that what really happened would be completely buried. Mike only remembers the airplane, Garrett in the car, the blood Ketchup, the yellow rabbit Frisbee, and his family not all of them sitting at the picnic table. This didn't bring the family closer together like William had hoped, his wife didn't lean on him for support while grieving and looking for their lost child, and eventually the Aftons divorced. William took Vanessa, because she asked to stay with him (because he told her to ask to stay with him, unless she wanted her mom to find out about Garrett) while Mike and Abby went with Mrs. Afton, who became Mrs. Schmidt. I wonder if he changed their names around while scrambling their memories one last time after the divorce, maybe Garrett was Evan at one point, and Mike (as he prefers to be called) was Michael, and Abby was going to be named Elizabeth.

Vanessa is given Garrett's plane as a trophy from William, and they continue luring children away from parties in the Pizzeria, while Mike does his best to take care of his mom and Abby. Years pass. The movie takes place.

I also think Garrett is haunting Abby. If she wasn't born yet when the Aftons went on that picnic, it would make sense that Garrett would attach himself to something or someone after a particularly traumatic death, right? Abby is seen talking to ghosts in the movie long before she visits Freddy Fazbear's Pizzeria, and one of her "imaginary friends" calls Mike a rude name after he sits on him. (It's gonna be so fun when Mike realized he said "at least I'm real" to his dead baby brother.) Afterwards, when Mike asks about what she remembers of Garrett disappearing, it seems like someone is telling her what to say for a second there. I think Garrett told her not to tell him anything, because he knew Mike would obsess over it and it would ruin their relationship. This was the moment Mike would have to choose Pizza or Spaghetti, because he can't have both, and the Pizza (Garrett) is already gone.