Beyond the Door II (1977)

When Dora, her new husband, and creepy little son Marco move into a new home, strange things start happening. Dora starts seeing her Carlo (her first husband who committed suicide), Marco somehow gets into the basement even though the door is always locked, and inanimate objects become threatening.

Marco becomes increasingly creepy, telling his mother he is going to kill her. There are also a few scenes which suggest his incestuous interest in Dora. He also seems to have some sort of supernatural power as he pins his pilot stepfathers picture to a swing, which makes the plane go into a nosedive. He also draws picture of his mother holding a knife and his father with his throat cut. The question becomes are the happenings supernatural or is Dora going insane.