Aunt Sophia is the catalyst of Double, Double, Toil and Trouble. She is the good twin sister of the villainess, Aunt Agatha, and it is unknown whether she is also an aunt of Christine Farmer, or if she is the latter's mother. She spends most of the film trapped in a mirror in the netherworld. She was portrayed by Cloris Leachman, who also played Agatha. Mary-Kate Olsen portrays her as a child.

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