Very tough situation. Yes, it can be challenged. Much will depend on the medical records as well as what the role of the attorney was. The attorney may testify against you or he/she may simply have drawn up the documents and not participated in their execution. You will need a skilled probate litigator, in order to have any realistic chance of prevailing. You have potential arguments of lack of capacity and undue influence.
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The factual circumstances need to be fleshed out but it is certainly suspicious when the revocation in four days before death and the party in in hospice care which means that they are commonly receiving significant dosages of pain medication. All of the paperwork, including the trust, deeds and will should be reviewed, and must be before an opinion can be formed which you could and should rely upon.
I cannot provide a learned guess as to your chances of prevailing for lack of information, but, as stated above, there is very good reason to have the validity of these transfers looked into.
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I agree with my colleagues but write only to add that you need to look very carefully (or more appropriately, have an attorney look at) the POA and the Trust document itself.
Certain POA documents and Living Trusts grant the acting POA/Trustee broad powers as to the authority to transfer property, creat or revoke trusts, etc. These documents are generally drafted in such a way to address potential Medicaid and Estate Recovery issues.
That having been said, even with a grant of such authority to the POA or acting Trustee, the POA or Trustee must, generally, continue to act in a manner that is consistent with the Grantor's (your friend's) intent.
My advice, see an attorney immediately.