Melissa Lutz is the youngest member of the Lutz family. She was about 5 years old at the time of the Amityville events at 112 Ocean Ave.
Melissa "Missy" Lutz is the daughter of Kathy Lutz and the stepdaughter of George Lutz. She is the younger sister of Daniel Lutz and Christopher Lutz.
Like the other children that are represented in the films, she is renamed in both films.