Pola Kinski, herself an actress, spoke to Stern ahead of the release of her autobiography.

BBC: Nastassja Kinski praises sister for reporting sex abuse

The actress, 51, whose films include Roman Polanski's Tess and Paris Texas by Wim Wenders, said she had read Pola's words and wept.

BBC: Nastassja Kinski praises sister for reporting sex abuse

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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The law was first tested last August after a car bomb blamed on ETA killed two people in the Mediterranean resort of Santa Pola.

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Pola's book Kindermund, she argued, would help "all the children, adolescents and mothers who fear their father and swallow this fear to hide it in the depths of their souls".

BBC: Nastassja Kinski praises sister for reporting sex abuse