Three's A Crowd
There is always more than one side to a story. In this case, the first experience you'll read about is that of William Afton, who is in the midst of a phone call with a business partner. His take is unique in that you'll only get to hear Afton's dialogue of the phone call- no outside detail, no "setting the scene."
Don't worry if the events taking place aren't completely clear just yet. At this point, they aren't clear to William, either.
The Father's Perspective
"It was never my intention to make them so... smart. The Artificial Intelligence program I installed got out of control, and before I could shut it down, they became self-aware.
"...No, I wouldn't feel comfortable letting anyone but myself do that. Each character has their own personal AI server, which is located within the chest section of the endoskeleton. The technicians could physically remove them, yes, but-
"Sweetheart, no, you can't go play with her. I've told you this time and time again; she's too dangerous for you to be around.
"...Sorry, what was I saying? Ah, right- while I'm more than confident in the technicians' abilities to physically remove the AI server, I doubt the animatronics would let them get close enough to let them try. No, the best solution would be for me to-
"I said 'no,' Darling. I know that the other children are in there, but they don't make her as upset as-
"...I'm sorry, I didn't mean to sound harsh. You are not an upsetting person, she's just... sensitive... Stay here, please.
"...Forgive me, my daughter is with me and she's quite the talkative type, haha... Anyway, I think the best solution would be for me to remove the AI servers myself. I am probably the only person that they might somewhat listen to. Once I remove the servers, I'll re-work the AI and also install some outside, ah... incentive for them to listen, if you'd like. Like an electric shock or something of that nature... Certainly, I can get started on that right away.
"...Wait, hold on a moment; how did that door get opened?! Sweetheart? Sweetheart, where are you?
"...
"Oh no... Oh no, no, no, no, she can't have...
"I-I have to go; my daughter, she- What the hell was that noise?!
"M-My daughter...! I have to go!"