Theme of the film

We have decided that we will have the theme of christmas in our film, as we decided to film in Faiths house when they still had the christmas tree up. We have also decided that we will use the idea that the antagonist being a 'delivery guy' but is after one of the protagonist. We have decided that Faith and me are sisters in the film, as it is a good explanation on how Faith can walk into the house without knocking and why she cares so much about me when I lie on the floor. .