Uqbah ibn Amir reported Allah’s Messenger (peace be upon him) as saying: Beware of getting into the houses and meeting women (in seclusion). A person from the Ansar said: Allah’s Messenger, what about husband’s brother, whereupon he (peace be upon him) said: Husband’s brother is like death.” (Al-Bukhari)
The same is applicable for husband with regard to the female relatives of his wives.
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Moreover, Ibn Abbas (may Allah be pleased with them) said: The Messenger of Allah (peace be upon him) said, “No one of you should meet a woman in privacy unless she is accompanied by a mahram (i.e., a relative within the prohibited degrees).” (Al-Bukhari and Muslim)
Most of our social problems come through uncontrolled mingling between male and female relatives. May Allah guide your husband to the straight path.