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For anyone who cannot wait for the Game Theory explanation for FNAF 4, the kid is Purple Guy's Son. He becomes the spirit that dwells within Golden Freddy. His father inevitably ends up in Springtrap AKA Golden Bonnie. The reason for the murders was a gradual way to achieve revenge on the children, including his elder son, who murdered the main character of FNAF 4.
Contributed by Sal Volpe