Your summary is confusing and made more so, perhaps, by the fact that you do not have a copy of what was signed. Whether you can set it aside or not is something that you will need to consult with an attorney about. No one can tell you your rights without being able to see the documents in question. The form may only grant your mother a life estate in the property if you die. There is no way to tell. See an attorney that specializes in estate planning and probate. The sooner you see someone, the sooner you can get some peace of mind and straighten things out.
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An attorney would have to review the documents in order for you to get an answer.
Otherwise-we would just be guessing.
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.
You need to take a copy of what you signed to an estate planning or real estate attorney. If you do not have a copy, you should look in the public records to find the deed to the property. It is impossible to give you advice without seeing the document.