Miss Piggy's Mother

From Muppet Wiki

Miss Piggy's Mother is a rarely seen or referenced character. Piggy looked fondly at a photo of her mother in The Case of the Missing Mother. Piggy recalled that when she was piglet her mother would tell her "Piggy, someday you'll be a star." Piggy talked about her mother stating "Ah she was so wise, so dear. So very much like moi, in fact."

Although never directly stated, applying genealogical relationships would establish her as the grandmother of Andy and Randy Pig as well.