Trivia: At the end of the film, the witches in black robes are all wearing red-and-white striped socks. This is a nod to one of the most recognizable witches of all time, the Wicked Witch of the East in "The Wizard of Oz."
Trivia: The entire outside of the house is fake - it's just a shell. Even the blossoms on the trees are fake - they're silk.
Answer: She is the one from the opening sequence, their "great, great, great" grandmother who started the whole "curse" thing.
Bruce Minnick