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The girls aren't just sisters, they are twins. The maid is the mother to both girls. The Duchess lost her child and her Husband believing they woulnd't have an heir used magic on both the maid when he stole one of the twins, and then on his wife. But the spell didn't work right and the maid switched them around and then fled. Helga has already confronted the Duke but the Dutchess doesn't know anything.