Mrs. Bates

Mrs. Bates was the mother of Andie Bates and the wife to Thomas Bates. She was killed prior to Thomas' and Andie's move to The Gates. Andie tells Charlie Monohan that her mother died in a car accident when she was younger and that was why they moved there. (Pilot) Andie finally learns the truth about her mother's powers, when her own succubus powers start to emerge. (The Monster Within)

After revealing the truth about her mother to Andie, he reveals that he and his wife was able to control it for years because they loved each other, only at a cost. Thomas was sick very often, which was a result of his wife's succubus side sucking his energy. He reveals the truth to Peg about the night Andie's mother died; She couldn't stop herself and he was forced to kill her. (Repercussions)