We very well know that Lily's father is Grandpa, but who on earth is her mother? "Grandma" is mentioned a few times by the Munsters. Once Herman says that about Grandpa's potential wife, Lydia Gardner, "Grandma'd be rolling around in here grave...if she had one." We also know some rumors that Grandpa has had many wives. Maybe Lily's mother isn't the same as Marilyn's mother's mother. And Lester (Lily's brother) may have a different mother, too! Much mystery surrounds Lily's mother, and we may never know her true identity. She was, however, a very large woman, as evidenced by her dressmaker's mannequin.