The ruling on a woman sitting with her sister’s husband while wearing hijab, in the presence of a mahram

Question:
May Allah bless you. The third question in this questioner’s letter says: My wife’s sister is covered and wears the khimar. When she comes to our home with her husband, she refuses to sit with us, greet us, or speak with us. She says that sitting, greeting, and speaking with men is forbidden, even though I am her sister’s husband and I had not met her before, and her husband and the family are present, of course. Is it forbidden for me to speak to her, greet her, and sit with her in the company of the women of the family, with her father and her husband present? May Allah reward you with good.

Answer:
There is nothing wrong with that, provided there is no seclusion and she is covered. If there is no seclusion, she is covered, and the conversation is ordinary, of the kind that is customary and has no objection in it, then there is no harm in her speaking with her sister’s husband. Yes. May Allah reward you with good.