Who is Shido's real sister?

Could you please clarify who Shido is and the context in which you're asking about his real sister? Without that information, it's difficult to provide an accurate and relevant response. However, in general, if we're discussing a fictional character named Shido, the question "Who is Shido's real sister?" would be asking for the identity of the biological sister of Shido, assuming he has one. This information would typically be revealed through the story or character development in the work in which Shido appears.