I tried to recreate the moment when the lost childrin's souls came to kill William because they didn't know his true story...
when William lost one of his kids to his insanity,and another to a prank gone wrong known as the bite of 87,he was so broken he let glitchtrap take control.When he did though,glitchtrap made him kill six kids at fazbear's pizzaria.then when William's wife found out about it,she killed herself by driving off of a cliff.then when William went back to help the children,this happened and he died as well.then his oldest son died at sister location as a night guard.Now,they are together again and known as the immortal family and the kids he killed forgave him,well...mostly.