Is it a sin if one does not feel comfortable with a particular person?

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A 12-year-old Muslim girl whose father is an atheist and her mother is Christian; they revile her Lord and her Prophet -- what should she do?
He has repented from interfering with his sisters’ daughters – what should he do?

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A 12-year-old Muslim girl whose father is an atheist and her mother is Christian; they revile her Lord and her Prophet -- what should she do?
He has repented from interfering with his sisters’ daughters – what should he do?

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