Why did Joseph, peace be upon him, ask his brothers to bring a brother from their father?

Why Joseph's brothers did not recognize Joseph when he spoke to them

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جزيت خيراً

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جزاك الله خيرا

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لماذا وضع صواع الملك في حمل أخيه واتهمهم بالسرقة واحتجز بعد ذلك اخيه ? مالحكمة من ذلك ?!?!