I would trust your gut ... if you have already been sworn in as Administrator, he will have to Petition the Court for whatever relief he is seeking. I would not worry about your duties as Administrator.
With respect to the fraud/forgery, don't contact any law enforcement - they can't do anything here. Only a judge can.
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I agree with the above answer in as much as the law does not require you to now halt everything and wait on this "secret" will to come down the pike.
But I think your deadline idea has something to commend it. Then, at least, you can send him written correspondence in a manner that proves he received it and show later that you were as diligent as you could be under the circumstances. As to the amount of time for the deadline, really, how long can it take for a person to just show you a copy of a will? I wouldn't necessarily give much.
Consider hiring a probate attorney. His fee will likely come out of the estate funds.
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Discuss with your attorney about the deadlines already in place by the court and writing a "deadline letter'.
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.
I agree with the other answers, but it is up to the son to produce the Will and petition the probate court to admit it. If he does, then you will need to address the issue of its validity. If the son refuses to request admission of the Will, then for all you know, he does not have one. The onus is on HIM to step forward and bring this matter to the court's attention. I am not sure why he has not already done so.
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