No, but you will need to prove that.
A valid deed cannot be nullified. If you were misled into signing a quitclaim deed and can prove it, then yes. The deed could be made null and void by a court order. It is going to be very difficult however. The language in a quitclaim deed leaves no uncertainty as to what rights you are giving up by signing it.
The term is actually "quitclaim", not "quick claim". The document must be signed, notarized and recorded and the recorder's office to be valid. It must contain the address of the property and a legal discription. It basically means "what interest I have in the property, I convey to you". This is not as good as a grant deed, which conveys a warranty of title. Consult a local attorney familar with the laws of your state for further assistance.
When the grantor says it is no longer valid. Or when the grantor is no longer living.
Until the grantor revokes it. Or the documents specify a date they expire. And after the grantor's death, the power of attorney is no longer valid.
No. An unsigned Will is not valid.
no
You need to consult with an attorney who specializes in probate and real estate law in your area. Deeds recorded after the death of the grantor can create title problems. There may be different practices in different jurisdictions. A title company may require some declaratory action to quiet title before it will issue any policies on the property. That means the expense of a court action that results with a court order recorded in the land records.
It is valid without expiration unless the document says otherwise. Or the grantor revokes the power of attorney. Also a power of attorney expires on the death of the grantor.
A statute of limitations is related to bringing a law suit. As such, there is no such thing as a statute of limitations related to a power of attorney. The power expires when revoked by the grantor or the death of the grantor.
No, it is still valid
No, there is no statute of limitations. It is valid until revoked or the death of the grantor, or as specified in the document.
Question is worded a little strangely, but, yes, it sounds like it is a valid contract. The agent presented the owner's contract, and you apparently agreed to it, by signing it.