Legal Question in Wills and Trusts in Georgia

First, is your son on the birth certificate or has he acknowledged paternity in some way? Georgia is very specific about this. Assuming your son was a resident of Georgia at the time of his death. Ordinarily, a child born out of wedlock cannot inherit from his father absent legitimation. Was the child legitimated here? If so, then a DNA test now will not be ordered as paternity has been established. If no, and the child wishes to file a claim against your son's estate, he will have to prove paternit and tests can be ordered by the court at that time. But I would not raise the issue.

However, I would get a probate lawyer in the county/state where your son resided at the time of his death as you are going to need assistance probating the estate. Note that probate only concerns probate assets and I don't know what is in the estate. If your son had a life insurance policy or some other non-probate asset and he made the child his beneficiary, then those assets will pass to the child or his guardian regardless of paternity.