Answer:
Basically two guys open up a pizza place for kids and one of them is a crazed killer and starts killing kids and putting them in suits, they open more pizza places at one point his daughter gets killed by baby (sister location) and he didn't like that so he scarred his other son in his house so he would never go near the animatronics ( fnaf 4) and then on day his son gets picked up by teenagers and they put him in the mouth of an animatronics and it kills him (the bite of 87) and the other dude who also owns the pizza places also the guy that made the spring lock suits doesn't like his partner much anymore because he is getting sus so he bans the guy from going to one of the places and in return he kills the guys daughter and eventually the souls were chasing him one night in one of the locations and he gets in the springtrap suits and kills himself on accident and gets his souls trapped in that suit but before he was being chased he has put his dead sons soul in a robotics suit and eventually when the building burned down with the guy in the suit he said he will be back but his son who is now in the robot is sent to get his sister soul back and put the soul in the robot he is in that's all I know