"To guide the bench and the bar, these rules should be observed with respect to the legal standing of private complainants in assailing judgments or orders in criminal proceedings before the SC and the CA, to wit: 

(1) The private complainant has the legal personality to appeal the civil liability of the accused or file a petition for certiorari to preserve his or her interest in the civil aspect of the criminal case. The appeal or petition for certiorari must allege the specific pecuniary interest of the private offended party. The failure to comply with this requirement may result in the denial or dismissal of the remedy.

If such appeal or petition necessarily affects the criminal aspect of the case or the right to prosecute, the reviewing court shall require the Office of the Solicitor General (OSG) to file a comment within a non-extendible period of 30 days from notice. The OSG’s comment must state whether it conforms or concurs with the remedy of the private complainant. If the OSG is not given an opportunity to comment, the private complainant’s relief may be set aside.

(2) The private cotnplainant has no legal personality to appeal or file a petition for certiorari to question the judgments  or orders involving the criminal aspect of the case or the right to prosecute, unless made with the OSG's conformity. 

The private complainant must request the OSG's conformity within the reglementary period to appeal or file a petition for certiorari. The private complainant must attach the original copy of the OSG's conformity as proof in case the request is granted within the reglementary period. Otherwise, the private complainant must allege in the appeal or petition for certiorari the fact of pendency of the request. If the OSG denied the request for conformity, the Court shall dismiss the appeal or petition for certiorari for lack of legal personality of the private complainant. 

(3) The reviewing court shall require the OSG to file comment within a non-extendible period of thirty (30) days from notice on the private complainant's petition for certiorari questioning the acquittal of the accused, the dismissal of the criminal case, and the interlocutory orders in criminal proceedings on the ground of grave abuse of discretion or denial of due process.

(4) These guidelines shall be prospective in application." (Austria v. AAA and BBB, G.R. No. 205275, June 28, 2022).