Does a woman have to cover her hands in front of non-mahram males?

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She lives with her husband’s family; does she have to wear hijab all the time?
Should he pray behind someone who says that it is not obligatory for women to cover their hair?

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She lives with her husband’s family; does she have to wear hijab all the time?
Should he pray behind someone who says that it is not obligatory for women to cover their hair?

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