The Amityville Horror
George (Ryan Reynolds) and his wife Kathy (Melissa George) move into a house on Long Island where the previous owner blew his family apart with a shotgun after hearing voices coming from the ghost of a reverend who killed and tortured a bunch of Indians (who have since become demons/ ghosts). After 28 days, George flips out and tries to kill his family because of the voices. His wife and child are able to talk him out of it, and they all get away from the house on a boat.
Thanks, Aaron B!
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Read more about this film at The Internet Movie Database.