Q: Is it permissable for a woman’s non-Muslim son-in-law to see her without hijaab?
A: The non-Muslim cannot be a son-in-law. If he is a non-Muslim he cannot be in your daughter’s marriage. They are living in a zina relationship.
And Allah Ta’ala (الله تعالى) knows best.
Q: I know that the relationship is zina, but my question was whether the non-Muslim “son-in-law” can still see his “mother-in-law” without hijab (due to hurmat-e-musaaharah, not due to the marriage being correct).
A: The mother’s wrong will be compounded when she knows that they are in zina and she is still seeing him. Is this not the height of stupidity?
And Allah Ta`ala knows best