ANSWER: This is not permissible unless its an emergency and no one else is there to help.  Prophet salla Allahu alaihi wa sallam said its better to be stabbed in the head by an iron needle than to touch a non mehram woman. 

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ANSWER: A step parent is someone married to your father or mother and they are your mahram A step sibling is not related to you via your father or mother and hence he/she are non mahram to you

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ANSWER: This is not permissible as Prophet salla Allahu alaihi wa sallam said its better to be stabbed in the head by an iron needle than to touch a non mahram 

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ANSWER: If the non mahram are with her in the same room physically, this is not permissible with you present and surely this is double not permissible with you gone out of the room!

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