The original appointment will last until the estate is settled; however, if you do not feel he is doing the job properly you could ask the Court to remove him and replace him with a different Administrator. Absent unusual circumstances 2 years is typically long enought to complete an administration.
Very truly yours,
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I am sorry your family is going through a time of such conflict. I am an attorney practicing in New Jersey. The administrator of an estate is supposed to act in a timely way to gather assets, pay taxes and distribute property. If the estate has not been closed within two years, it may mean that the administrator has been negligent, but estates often remain open for longer than two years. I have a question, however, about why the administrator wants to transfer all of the property into his individual name - if this is what you meant. This would not be appropriate unless each of you wishes to waive your right to receive a share in the estate. You should consult with an attorney experienced in these matters. A complete review of the facts, as well as the documents he has asked you to sign, is necessary in order to advise you regarding your options.
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Each state has different probate rules about what an administrator must do. If you feel that your brother has mishandled the estate and you wish to complain to the court, you need to do that while the estate is open.