How To Write A Letter Giving Legal Guaardian Uthorization . On behalf of xyz corporation, i authorize you to represent us for our legal case against mr. If you would like to authorize someone as a guardian for your child, here is a sample template you can use to write an authorization letter as a guardian. Notarized Letter for Guardianship Template Examples Letter Template from simpleartifact.com Leave one line and write the date. I am the father of mr. Respected sir/madam, dear sir/madam, this letter is a legally binding document that gives ______________ temporary guardianship of ___________.