The Afton Family = Funtimes theory

We know William was a terrible father. But what if. What if he saw Charlie's possession of The Puppet and decided to recreate it. What if he engineered the deaths of his children? Because in his twisted logic "if Henry's kid can do it, then so can my children"

CC and Elizabeth were his test subjects for remnant before he went for a more personal experiment.

Headcanon. The reason Michael and CC don't appear in the Silver Eyes trilogy is because they died at the hands of Funtime Freddy and Foxy. Funtime Freddy mimiced and lured CC and CC is the child in FF's storage tank. Michael was lured by Funtime Foxy's parental voice sync. The Afton kids posses the Funtimes in TSE timeline

Funtime Animatronics are the representation of the Afton Family

We all know that Baby was made by William Afton based on his daughter Elizabeth, but I believe that Baby is not the only animatronic inspired by his family. The amount of funtime animatronics created for circus baby is the same amount of people your family had and the choice of animatronic designs also reflects your family:

William Afton never had the family he wanted, so he created the Funtimes that way to satiate his need for a perfect family along with his unhealthy obsession with murdering children and putting them inside animatronics.

This would explain why these Animatronics designs were chosen for the sister location and why there never was a Funtime Bonnie, because her alter ego was already Spring Bonnie.

Headcanon. William designed the Funtimes for his family.

And all used to kill in their name

Imagine an au where instead of Elizabeth getting scooped, Michael is lured by Funtime Foxy's parental voice sync, killed and possessing Funtime Foxy

Molten Freddy redesign by  friskyoutubee

Source 2

Consider this. FNAF animated series, but it’s Happy Tree friends styled of the animatronics killing security guards/technicians/Pizzeria staff on a daily basis.