No, the borough and landlord may not be charged: it is NOT their responsibility to make sure no minor children are living there. You cannot hold someone liable for anything which they do not have a duty or obligation to do, and the borough and landlord have no duty vis-a-vis your children in this regard.Your ex may be guilty of child endangerment IF the children have been put in danger by this. The CO is just a piece of paper: it's lack does not automatically equal danger. You'd have to show that there was in fact danger to charge your ex with child endangerment.