My father died, am I entitled to his estate.

If you are legally recognized as one of your father's children, then under Georgia law (assuming he had his principal residence in Georgia at the time of his death), you are one of his heirs. That means, if he had no Will, you are one of the people who will receive any assets that (1) became part of his probate estate at his death and (2) are left over after all debts, expenses, and taxes are paid in full. This assumes that he has no spouse (as you stated) and no children who are under 18. Children under 18 can make claims for year's support against his probate estate and may thereby come in front of at least some creditors and expenses, but they have to file the claim before they turn 18. Whether assets became part of his probate estate is another issue. If a beneficiary designation points assets to a specific person, that person receives those assets, and they do not become part of his probate estate. If he owned an asset in his own name, and there was no beneficiary designation on it, then that asset likely did become part of his probate estate. If he had an asset like the retirement benefit you mentioned, and failed to designate a beneficiary on that asset, then the next question is what does the contract that relates to the benefit provide as the default beneficiary? It could be his estate, it could be next of kin; you need to find out. In order for anyone to be able to answer your question as to what interests you and your sister may have with regard to your father's estate in detail, they will need to know a lot more information than can or should be provided here. Please consult an attorney where your father had his principal residence and let the attorney go over the situation with you and help you figure out what rights you may have.