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Does your father have any other children who could have inherited the house?
As a general matter, it is important for a person to review their will every year or two and make any changes as necessary. Why? Because things change. For example, property gets transferred, beneficiaries die, folks have arguments, etc.
So, while your father is still of sound mind, it would be prudent for him to review and update his will.
Now, that being said, what happens about the house if he doesn't update his will? Nothing. Things will stay as they are. A will only authorizes the transfer of assets that the person owns AT THE TIME OF THEIR DEATH. If your father no longer owns the home, then he doesn't own it at the time of his death, and, thus, his will is meaningless on that issue. The quit claim deed wins.
Good luck and best wishes! I hope that you find this information to be helpful and this answer to be ACCEPTable!
Attorney
Michigan lawyer who explains basic criminal, consumer, and contract-related matters.