The Ending of Movie is not Typical
I saw the movie and I realy like it much , It has different ending than typical horror movies of the family who live in remote or haunted houses. In many movies the family members such Father, Mother , Son and Daughter all survived and other peoples like Cops, or Electrician or maid etc usually became the victim of Demons or Monsrters and in the end, Haunted House usually is burning.
In this movie Father died, Mother was attacked by demon (assuming died) , Daughter and son both Trap in Tunnel by Demon in Daughter's love intrest form and the real guy trapped in haunted home where movie end leaving many questions about them, i.e unpredictable.