"One-Eye, Two-Eyes, and Three-Eyes" by the Brothers Grimm.
Once upon a time there was a woman. She had three daughters: the eldest had the only eye, the middle had two eyes like normal people, and the youngest had three eyes.
The mother and sisters couldn't accept Two-Eyes because she was very simple. Then, with the help of magic, she was able to take care of herself.
Having suffered betrayal by her family, the character met a young knight and married him. At the end of the tale, Two-Eyes forgave One-Eye, and Three-Eyes.
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