The probate court enforces the Last Will. The court will not change a Will that the decedent herself did not change. You have no legal basis to challenge the document based on the facts you describe. Your friends testimony as to what the decedent would want is inadmissible and irrelevant.
In any event, the estate has no money and the real estate is underwater. It would be a waste of money to challenge the will even if you could. Successful will contests are expensive.
The Will stands. Oral expressions of intent are not enforceable. I do not see any basis for contesting the Will under these facts.
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There is presumption that a valid Last Will reflects the decedent's last wishes. In order to preserve the integrity of wills in general, the courts do not allow testimony as to the decedent's changed or newer wishes, as this would make almost every will into a will contest. In your case, it's possible that you can buy the house as it's underwater and no one seems to want it.
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If the Last Will was valid (two witnesses, etc.) and there is no new Will, then you will be wasting your money if you hire an attorney to see if it can be challenged - it can't. Not in FL. Not based on the information here. Sorry!
Carol Johnson Law Firm, P.A. : (727) 647-6645 : firstname.lastname@example.org : Wills, Trusts, Real Property, Probate, Special Needs: Information provided here is anecdotal and should not be relied upon or considered legal advice. Every matter is different and answers given here are general in nature and may not reflect current Florida law at the time you are reading this posting. Please contact me if you feel you need additional assistance with your matter.