The wife of the wife's grandfather

Q 2: Is a man a Mahram (unmarriageable relative) for the wife of his wife's paternal grandfather?

A: It is not permissible for the grandfather's wife to be unveiled in the presence of the granddaughter's husband of another woman, as he is not one of her Mahrams. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.