Your husband does not have any right to go out or to sit alone with his female cousins. They are not mahrams for him. `Uqba 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. The same is applicable for

The same is applicable for husband with regard to the female relatives of his wives. 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).” Most of our social problems come through uncontrolled mingling between male and female relatives. May Allah guide him to the straight path.