>>536288818
With all this in mind, the reason for Sister Location's entire existence becomes pretty obvious: Setting the record straight on what 4 (and 1-3 by extension) were about, giving us a game in which the creator of (some of) the animatronics be called Afton and another protagonist called "Mike" whose motivation is to help free the soul of a family member, while the Custom Night helped further clarify that Mike was the son of Afton/Purple Guy and the brother of girl possessing Circus Baby, which helps fill in the mystery of the empty room in the house with the broken Mangle toy. While I don't think Scott had settled on the idea of Mike being the Purple Guy's son (he got Ennard inside him) at the time of 4's release, there's nothing preventing it in that game, so he decided to roll up the Crying Child, Mike, the Purple Guy, and the girl possessing Baby into one big family to help further cement the idea of the games all being connected by a unified thread.