What Is Proof of Service in a Guardianship? (GC-510) This form explains the proof of service requirements in a guardianship of the person case. This form is for informational purposes and is not filed with the court. Get form GC-510 espaƱolGet form GC-510 in Spanish (Spanish) Effective: July 1, 2007 View GC-510 What Is Proof of Service in a Guardianship? form Go to How-to instructions for Guardianship Go to Guardianship Form Packets