Either you or your sister will need to file a Petition for Probate to transfer the houses either as stated by law or as you and your sister agree.

Contact an attorney in Georgia and provide him/her with the evidence to support your claim so he/she can look into it.

As stated, she must sign the document in order to make the Will valid. It is her choice if she wants to sign it or not.

You will need to file a Complaint to Quiet Title which is complicated in any event and made even more complicated based on the fact that he is...

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If you present it to the clerk, pay the fee, and they file it, yes you have filed a lawsuit. You need to personally serve it.

Your situation is way too complicated for a general question and answer site, but I have to tell you if you quitclaimed the property to him, it is...

They probably cannot, but an attorney will have to review the relevant documents to determine what rights you have if any.

This is a great question for your attorney. Usually discover can commence 20 days after service on the opposing party.

The answer is to look at your divorce decree. If he got the house in the divorce, you do nothing. His heirs or beneficiaries will have to probate...

Simply file a Request for Dismissal. Know that if the other side has appeared, they may be entitled to their costs, so consider a settlement first.