who is the mother of cortana?
<answer> Dr. Halsey is the mother of Cortana. <context> Shortly afterward, Cortana took control of the ship, and returned the survivors to Reach, where the group helped to rescue survivors of the Raid of Reach, including her mother, Dr. Halsey. She managed to improve on the ship's weapons and slipspace capabilities, jumping below Threshold's atmosphere, a technique never accomplished before by the UNSC.