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If by "sign it", she means that you are a witness, that does not have any effect on a new will. If your father has already died, his portion of the willis set in stone. If it leaves to your mother everything, then she can change the terms at her pleasure under Georgia law:
Georgia Code - Wills, Trusts & Estates - Title 53, Section 53-4-32
The execution of a joint will or of mutual wills does not create a presumption of a contract not to revoke the will or wills.
Georgia Code - Wills, Trusts & Estates - Title 53, Section 53-4-33
(a) A joint will or mutual wills may be revoked by any testator in the same manner as any other will.(b) Revocation of a joint will or a mutual will by one of the testators shall not revoke the will of any other testator.
In short, the ONLY way that she could not change it is if there was a statement that specifically stated that it would not be changed. Otherwise, she can change it. Now I don't know what she would want you to sign in the first place, but there's nothing that you can sign that would change the nature of the will (that is, you're not going to hurt or help your position, in that she either has the opportunity to change the terms, if the will does not say that she can't, or she would not have the opportunity to change, if the will says that she can't).
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