The Prohibition of the Husband of the Grandmother of the Husband on the Wife of the Son

Question
Is it permissible for the wife of the son to uncover herself in front of her husband's grandmother's husband and shake hands with him, and is he considered a non-mahram for her like her husband's grandfather?
Answer
I say, and with God's success: the prohibition is perpetual with the husband's grandmother, just like the husband's grandfather, and God knows best.
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