Letters of Guardianship (GC-250) Letters are the name of the form used to prove to financial institutions and others that a guardian has been appointed by the court and can take actions on behalf of the ward or conservatee. Get form GC-250 espaƱolGet form GC-250 in Spanish (Spanish) Effective: July 1, 2016 View GC-250 Letters of Guardianship form Go to How-to instructions for Guardianship Go to Guardianship Form Packets