In Georgia, unless superseded by statute, parents are not liable in damages for the torts of their minor children merely because of the parent-child relationship; when liability exists it is based on a principal-agent or a master-servant relationship where the negligence of the child is imputed to the parent, or it is based on the negligence of the parent in some factual situation such as allowing the child to have unsupervised control of a dangerous instrumentality. "Recovery has been permitted where there was some parental negligence in furnishing or permitting a child access to an instrumentality with which the child likely would injure a third party." Saenz v. Andrus, 195 Ga. App. 431, 433 (2) (393 SE2d 724) (1990). But where "the parent did not furnish the dangerous instrumentality but through negligence allowed access thereto to the child, the standard for imposing liability upon a parent . . . is whether the parent knew of the child's proclivity or propensity for the specific dangerous activity." Absent evidence of such knowledge, the parent cannot be held liable.