The father's brother's children are mahram (forbidden to marry) to his other wife
Machine translationRead the Arabic original
Question:
May Allah reward you with good, and may He do you good. Likewise, I ask you regarding my father's brother's children: are they mahram to my mother as well?
Answer:
Yes, because your father is their grandfather, and a grandfather's wife is mahram to his grandchildren.
May Allah reward you with good, and may He do you good. Likewise, I ask you regarding my father's brother's children: are they mahram to my mother as well?
Answer:
Yes, because your father is their grandfather, and a grandfather's wife is mahram to his grandchildren.
Source
قناة «العلامة الدكتور صالح الفوزان»، 4995- أولاد الأخ من الأب محارم لزوجته الأخرى - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.