Is it permissible to marry the daughter of a brother's daughter?
The daughter of a niece (daughter of a sister's daughter) is permanently forbidden (to marry). She is included in the generality of Allah's saying: "and daughters of brothers and daughters of sisters." Thus, her ruling is the same as that of a brother's daughter in terms of being forbidden, and it is not permissible to marry her.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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