Okay, Crossover Time.

Mike: Relative
Lydia: Mike's daughter
Crying Boy: Restless spirit/Enchantress

Here's how it would start:

In 1987, Freddy Fazbear's Pizzeria was crowded for a birthday party. They were having such a fun time until one of the animatronics bit a child on the head, and the place was closed down. Later in the years, the Pizzeria opened again, hoping to try and get a good reputation again. Until one day… 5 children arrived at the pizzeria and they watched the animatronics play their music. But one by one, they started to disappear to the supply room and all five were murdered by an impostor in a Golden Freddy suit. The children were then stuffed into each of the animatronic suits, even the golden one. And suddenly, a ghost appeared to him after the murder and said to him," We know what you did… Your act of crime, you and this pizzeria will be cursed for all time. These children will haunt you until the end of your days. Even if you leave, you can't escape THEM. If these poor souls find someone to free them, we'll be coming for you." So the pizzeria was cursed since that day, but will these animatronics that hold their restless spirits be set free?