My colleague, Ms. Blaustein is correct. If your father died in 20089, and you were sent the Notice of Probate required by the Rules of Court, you then had the opportunity to file a caveat or protest to the probate of your father's Will. The Statute of Limitations has long passed.
Your facts are a little unclear, it sounds as if dad had lived in CA, but was moved to NJ when he was about 92, and died in NJ. If this was the case, and a new will was drafted while your father was in your brother's "custody" and "care", those facts alone would, if brought in a timely fashion, cause a court to compel your brother, not you, to prove that he did not pay and influence the attorney, or unduly influence your father to give your brother a larger share of your father's estate. Having sat back, the matter is no doubt closed, other than for having your brother provide a formal accounting.
An accounting looks at the will to determine what it says and how your brother handled the administration of the estate, but does NOT allow you to contest the validity of the will.
Sorry for your heartache and dispute with your brother. I see it more often than I care to admit. These disputes destroy families.
The foregoing is not intended to be legal advice upon which you may rely as I have not been retained for this purpose.
There are too many questions to really advise you. If an estate was opened you are probably too late to contest it. Take all of the documents (will, death certificate, etc) to an attorney to discuss whether it is too late for you to do anything or if you have any options.
The above answer is not to be considered legal advice and should not be relied upon as such. You should consult your attorney for specific legal advice as to your individual situation.
You can contest but you need to have facts and documents to prove it. It is not what you know, but what you can prove.
Attorney answers to questions are for general purposes only and do not establish an attorney-client relationship. There are always specific facts that are important for an attorney to review before providing advice to a Client. In no way should you rely on the response provided herein to conduct your legal affairs on your own. You should always hire an attorney before you rely on advice provided.