Is it permissible for men (even if accompanied by their wives) to enter the house in the absence of the head of the family (the husband)?

The basic ruling is that it is permissible for non-mahram men to enter your house with their wives, with your husband's permission, provided that you observe full hijab, do not speak alluringly, ensure that there is no fitnah (temptation), and avoid khalwah (private seclusion). Despite its permissibility, it is preferable to avoid this in some environments where the barriers between genders are weakened.