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I am sorry to hear about this situation.
Can the Deed be Revoked?
Short answer is no, I am afraid. While under KY 382.110, the deed has to be recorded to be effective against future buyers, the deed itself is effective at the time of signing between its grantor and grantee. In other words, just because he has not filed it does not mean it is not binding. If he was quitclaimed the property, then it is his now even if he did not file the quitclaim deed with the county.
A quitclaim deed cannot be "revoked."
However at the same time, someone in your situation can act to protect the elderly individual. I assume the property is 100% his and if so, he cannot be asked to move. But one can take legal guardianship of the grandmother and get her the help she needs and relocate her out of the property. See HERE. If no one is willing to do this but she still needs help, the county may take guardianship if it feels that she is being neglected by him. One would have to file a complaint with the Department for Community Based Services (DCBS) by calling 1-***-***-****.
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