Sometimes we need an authorization letter for birth certificate in order to complete immigration process or other procedures . Here we have a simple and good example!!
To Whom It May Concern,
I, [name], do hereby authorize my son [name] to request a copy of my Birth Certificate. I have been living abroad for 25 years, and I would need an original copy of Birth Certificate to complete my immigration process here in [place].
Attached with this letter is a photocopy of my passport. Please kindly extend any assistance to my son on this matter.
Thank you very much