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Wives’ mothers and all their female ascendants.
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Their daughters and all their female descendants, provided that he has consummated the marriage with their mothers1.
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The wives of fathers and all male ascendants.
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The wives of sons and all male descendants, whether the relationship is by blood or nursing.
517—The basis for this is:
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The words of Allah Most High: “Forbidden to you are your mothers…” through the end thereof2 [al-Nisā’: 23, 24].
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The Prophet’s words, peace and blessings be upon him: “What is prohibited by nursing is the same as what is prohibited by blood relationship or by birth.”3 Reported by al-Bukhārī and Muslim4.
518—As for women temporarily forbidden in marriage:
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They include those covered by the Prophet’s words, peace and blessings be upon him: “A woman may not be married together with her paternal aunt, nor may a woman be married together with her maternal aunt.” Reported by al-Bukhārī and Muslim5.
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As well as the words of Allah Most High: “And that you marry two sisters at the same time” [al-Nisā’: 23].