there was a guy called william afton who was really good at engineering and found a partner called henry emily and they first made a restaurant with 2 animatronics. this was in the 80's, so this was impressive
the restaurant was doing good, that the child of william wanted to have his party there. but when his big brother and his friends came in, they put him in the mouth of one of the animatronics
The fnaf lore explained in one post. A kid puts his brother in the of a robot bear. The brother dies. THE FATHER KILLS HIS CO-WORKER'S DAUGHTER AND 5 MORE KIDS. THE KIDS GET PUT IN ROBOT SUITS. THE FATHER DIES IN A BUNNY ROBOT SUIT. HIS SON DIES DUE TO HIS INSIDES BEING TAKEN OUT. HIS DAUGHTER DIES AND KILLS HIS SON. THE FATHER BURNS MORE THAN 1 TIME. EVERYONE BURNS. THEY BUILD A NEW PIZZA PLACE BUT IT BREAKS. THE END.