Is it permissible to visit the family of one's wife, when one of its members drinks alcohol and the head of the household does not condemn this action? And is it permissible to prevent one's wife and children from visiting them?

It is permissible to visit the wife's family for legitimate purposes, such as maintaining kinship ties. The presence of a disobedient person does not prevent this, but the disobedient person and the head of the family should be advised regarding his silence. It is permissible to prevent the wife and children from visiting if there is fear of corruption or temptation befalling them, and she must obey.