When you file a Petition to Probate a Will or a Petition for Letters of Administration in Georgia, you must give notice to all heirs-at-law. Why? Because those are the persons who have legal standing to file an objection (caveat) to the Will or file an objection to your Petition for Letters of Administration.
What happens if you can’t find them? You must inform the court that you diligently tried to locate them. The following form may be used to document your diligent search. Assuming the affidavit is accepted, heirs-at-law who could not be located will be served by publication.
Source: Cobb County Probate Court (modified here for use in any county)