The Amityville Horror (2005) on Netflix

George and Kathy Lutz along with their three children are moving into an elegant Long Island house. What they don't know is that six gruesome murders were committed there the year before - Ronald DeFeo Jr., the oldest son in the family, murdered his parents, his two brothers and two sisters by shooting them with a .35 caliber in November 1974. No sooner are the Lutzs moved into the house than they begin seeing horrible things - the ghost of Jodie DeFeo, horribly disfigured bodies - and hearing ghostly voices throughout the house. George seems to notice it the most, and it isn't long before he becomes a danger to those around him. When the local priest called in to bless the house, comes charging out in horror after being swarmed by flies, he issues a dire warning to Kathy - "Leave that house". But will they be able to escape before the house and its vengeful spirits take control of George - and make him into a deadly menace?