Answer
Under Article 2180 of the Civil Code, responsibility for a quasi-delict may be demanded not only from the person who caused the damage but also from those responsible for him: parents for the damage caused by their minor children who live in their company; guardians for their wards; employers for the damage caused by their employees acting within the scope of their assigned tasks; and owners and managers of establishments for their employees. This liability is direct and primary, not merely subsidiary.
The person made vicariously liable may escape liability by proving that he observed the diligence of a good father of a family to prevent the damage. This requires concrete proof of due care both in the selection (culpa in eligiendo) and in the supervision (culpa in vigilando) of the person who caused the harm — bare allegations of diligence are not enough.