Patty Halliwell was Prue, Piper, and Phoebe's mother. She had the same power as her middle daughter, Piper, the power to freeze. Sadly, Patty was killed by a water demon when her children were very young and she never got a chance to see them grow up. She did meet her adult daughters once though, when they returned to the past to help stop an evil warlock from gaining immunity to their powers. This was a momentous occasion for Prue, Piper and Phoebe since their mother's death had always been the darkest moment in their lives. Seeing her again was both wonderful and painful. Youngest daughter, Phoebe, even left a note warning her mother of her impending death. But at the last minute Phoebe took the letter back, realizing that she could not change history.