Gram's name is Penny Halliwell; Jennifer Rhodes plays her character. She was the sisters Grandmother and a powerful witch herself. She owned the manor before the sisters did. She was married more than once and took care of the sisters after their mother, Patty died. Grams was the one who bound the sisters' powers, that is why when she died their powers were unlocked. She has visited the sisters a few times since she has died. She also married Piper and Leo