What is ""خواهر ناتنی"" in American English and how to say it?

Persian

خواهر ناتنی

خواهر ناتنی-foster sister.svg
American English

foster sister

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Example sentences

American EnglishMy foster brother is taught me how to play cards.

How To Say ""خواهر ناتنی"" In 45 Languages.