Sitting with her sister’s husband while wearing the hijab

Question:
May Allah reward you with good, and may He do you good. Is it permissible for a Muslim woman who wears the Islamic hijab to sit with her husband’s brother?

Answer:
Yes, meaning, if she is wearing the hijab and there is no seclusion, if she is wearing the covering hijab and there is no seclusion, and there are people present with them who remove the seclusion, then there is no harm in her sitting with him. However, if she is not wearing the hijab, or if the sitting involves seclusion with a man who is not among her mahram (relatives one may not marry), then this is forbidden. The Messenger of Allah (peace and blessings be upon him) said: “No man is to be alone with a woman except that Shaytan is the third among them.” So seclusion with a man who is not a mahram for the woman is forbidden, because it is a means to what is forbidden. Yes.