In 1976, Polanski began a relationship with actress Nastassja Kinski, who was 15 years old at the time.

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There was no immediate comment on Pola's book from her half-siblings, Nastassja and Nikolai, when their representatives were contacted by Reuters news agency.

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"My sister is a heroine, because she has freed her heart, her soul and also her future from the weight of the secret, " Nastassja Kinski said.

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