I am very sorry to hear this. It is difficult to lose one parent, even more so when a sibling cannot be trusted to honor their wishes.
There are a couple of possible issues.
First, a personal representative/executor has a fiduciary duty to the estate. This means the people that are named in the will. A fiduciary duty means that the person in the fiduciary capacity owes a duty to the other person- and that the fiduciary must act in good faith, with the best intentions, to preserve any property that is at issue. Failure to act in this manner (essentially, a trust/guardian) is considered a "breach" and can result in:
1. removal of the fiduciary
2. sanctions (ie fines, award of attorney fees, etc)
3. damages (economic liability for the damages suffered by the party to whom the duty was owed)
So the heirs can sue the personal rep for the money currently owing, as set forth in the will. This can include attorney fees and court costs, as that will help restore the heirs to the position they would have been in had there been no breach. Often times a demand letter will suffice, as the fiduciary will not want to have to reimburse legal fees. The court can also remove the fiduciary.
Additionally, a will can be challenged- based on "undue influence". This is used when one person uses their position of trust to manipulate the elderly- to take advantage of their vulnerable state. If this is proven, the court will throw out the will and either enforce a prior will or distribute the estate to the next of kin (ie to all children equally). The idea of undue influence is that the person manipulated the elderly to do an estate plan that they normally would not do.
Lastly, if the signature is forged, then it can be challenged as a forged legal document. This can also result in criminal charges.
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No attorney client relationship is created as this is general legal information, not advice; and a personal attorney should be hired if one wishes specific legal advice for their personal situation.