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|Halacha - Yichud|
|Submitted by Yosef Answered by Rav Peretz Moncharsh|
No, it's not a problem to be alone with even a half sister because Chazal understood that one is not attracted to his sister in the same way as other females. However, one may not live alone in the house with even a full sister for more than 30 days in a row.