For many years Grams, otherwise known as Penny Halliwell, was the head of the Halliwell home. She was an extremely powerful witch who raised her daughter, Patty, in the Wiccan ways. After Patty was killed, Grams raised Prue, Piper and Phoebe, the children Patty had left behind. Unfortunately, the kids never got a chance to learn the same skills their mother had. Grams had bound their powers many years before to keep a warlock from stealing them. It wasn't until Grams died and the sisters' reunited, that they finally reclaimed their powers. It seems that Grams still watches over the girls, occasionally providing a little help from beyond the grave.