The daughter's husband is among the mahram relatives

Question: There is a woman who has a married daughter, and this woman covers herself in front of her daughter's husband, does not eat with him, and even on occasions of celebration, she does not greet him. What is the ruling on this?

Answer: The daughter's husband is a mahram relative to her mother; based on the statement of Allah the Exalted in explaining the prohibited relatives: [Surat al-Nisa: 23]; and this is a matter agreed upon by the scholars. Therefore, the woman's mother and her grandmothers, whether through her father or her mother, are all mahram relatives to her husband due to the aforementioned verse. However, she is not obligated to uncover her face for him or eat with him. If she does so, it is better and more preferable, so that love and affection prevail between them, and so that she complies with the ruling of Allah, which has made it permissible for her.