Are you kidding me??
The father dies a horrible death in the house, clearly by something not human, and in the same scene they're taking his body away later on, the nurse tells the kids to go to their beds in that same house?? It's ridiculous they're still staying in the house after that.
What's up with the demon as well? It has so many inconsistencies. On the one hand it can throw people around like rag dolls, manipulate inanimate objects, but if it's chasing you and you shut the door on it, it'll have trouble getting in. When it comes to the mother and father it's happy to murder them then and there in a horrible fashion, but when it comes to the kids it's happy to just jump scare (of which there were far too many by the way) them most of the time. I guess this evil demon does have some degree of morality after all.