Penny Halliwell

Penelope "Penny" Halliwell (née Johnson), more commonly known as Grams, is the daughter of P. Baxter and Gordon Johnson. She was married four times, the most significant of which being to Allen Halliwell, with whom she had her only daughter, Patricia Halliwell. Through Patty, Penny was the maternal grandmother of the Charmed Ones.

As a descendant of Melinda Warren, Penny inherited the power of telekinesis, and was one of the most powerful and Craft-dedicated witches of the Warren line. She was also responsible for the creation of many spells and potions in the Halliwells' Book of Shadows. She raised her granddaughters after their mother's death, and became a guardian spirit of sorts to them after her own passing, providing good advice and even the occasional direct assistance when necessary.