I don't know what statute of limitations might be applicable while the probate remains open. However, I urge you to consult with a probate attorney right away, just in case there is some sort of limitations period. Most probate attorneys will give free consultations.
If you are a beneficiary, the executor works for you. It's time to take the initiative and demand what you deserve.
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You mention that your sister is the executor of the estate. Was she appointed / approved by the probate court? Was a petition for probate filed? Have you spoken with your sister or formally demanded an accounting for the estate thus far?
It is time to take the initiative and consult with a local probate attorney to review all of your facts and circumstances so that you can make an informed decision on how to proceed.
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There is no "statute of limitations" for closing a probate estate. In most counties in California the probate court keeps track of cases by setting a date by which the estate should be closed at the time the court admits the will to probate. It generally sets a date for an order to show cause why the estate is not closed a year or so after the executor is appointed. If a probate has been opened, you should check the court file. Also you might consider filing a "request for special notice" in the estate. That would entitle you to a notice every time something occurs in the probate court. If you cannot afford a lawyer, the Orange County Bar Association has a panel of lawyers on a low fee/no fee basis - they generally give some free consultation as well. You might check with them.
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