You do not say how many heirs were underpaid and how many were overpaid. You might consider suggesting that the lawyer repay the underpaid heirs out of his or her fee. Failing that, you may very well have a claim against the Lawyer.
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Retain your own counsel to attend the conference with you. Do not go unrepresented.
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Unless the court can work it out, the underpaid heirs should hire a legal malpractice lawyer and consider suing the attorney.
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My colleagues all give good answers. I only add that when a distribution is made such as you describe it is normal practice to have the beneficiary sign a receipt and release agreement that may contain a 'claw-back" clause which means the error (malpractice) can be corrected by having the overpaid disgorge as per the receipt and release agreement terms, thereby not making it the attorney problem but the overpaid to figure out what to do to come up with the funds. If such is in place then you will not likely get the attorney to pony up the difference jut because you feel badly for the overpaid having to refund the monies they are not entitled. You could leave it as is and enter into a Stipulation of Settlement among all overpaid and underpaid to leave things as they are....and then ask the attorney to do this aspect for free and give a refund of some portion of his fee for the problem if he is unwilling to dig deep to fix it as you are hoping will be the legal mandate by the Surrogate's Court.
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