Two different endings
I've heard of two different endings.
1. The hacky "It was all in their head" twist.
2. Bella Thorne's character is innocent, but gets blamed for the murders.
I wonder which ending came first?
No one of those endings.
SPOILER:
Bella Thorne had to fight with his bother which is also a demon and killed him. His mom knew about Amityville murders and that's why she wanted to see his son alive.