Aunt Mushy is a ghostly relative of Fenwick Quarrel, the deceased great uncle of the sorcerous couple Selwyn and Tallulah, and as a ghost amiably haunts their home Quarrel Castle. Fenwick calls her an "aunt, twice removed." She appeared in the episode "Smurfing For Ghosts", when she along with Fenwick's other relatives are with Fenwick coming to visit him for his Ghost Day.