Is the grandfather’s wife forbidden to his grandchildren?
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The questioner : He asks about a man who has two wives, one of whom has left him and the other remains. The woman who left has daughters, and one of the daughters has married and reconciled with her children. Does anyone become forbidden to the wife who remains with him, or not?
The Shaykh : The answer is yes, they are mahram (a relative one may not marry) to your remaining wife, because the woman remaining with him is the wife of their grandfather. The wife of a grandfather and the wife of a father are mahram to his sons, his grandsons, and the sons of his daughters as well, no matter how far down the line they go. So anyone to whom you say, “O father” or “O grandfather,” whose wife is not your mother, is a mahram to you, based on the generality of the saying of Allah the Exalted:[An-Nisa 4:22]
The Shaykh : The answer is yes, they are mahram (a relative one may not marry) to your remaining wife, because the woman remaining with him is the wife of their grandfather. The wife of a grandfather and the wife of a father are mahram to his sons, his grandsons, and the sons of his daughters as well, no matter how far down the line they go. So anyone to whom you say, “O father” or “O grandfather,” whose wife is not your mother, is a mahram to you, based on the generality of the saying of Allah the Exalted:
And do not marry those [women] whom your fathers married, except what has already occurred. Indeed, it was an immorality and hateful [to Allah] and was evil as a way.
وَلَا تَنكِحُوا مَا نَكَحَ آبَاؤُكُم مِّنَ النِّسَاءِ إِلَّا مَا قَدْ سَلَفَ إِنَّهُ كَانَ فَاحِشَةً وَمَقْتًا وَسَاءَ سَبِيلًا
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 14 - 17 - دروس وفتاوى المسجد الحرام للعام 1403 هـ - الدرس الرابع عشر - الشيخ محمد بن صالح العثيمين — youtube.com (58:36)
The Arabic text is a machine transcription of the audio recording.