Probably nothing. If he retained the lawyer for the probate matter too, then communicate with the lawyer instead of with your brother.
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As the beneficiary of an estate you have the right hire your own counsel to represent your interest. It may be better for your family relationships if you hire your own attorney and have the two attorneys speak to each other instead of you and your brother.
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As your brother has decided to speak through his counsel and does not want contact with you directly, then contact him through his attorney. The attorney is under obligation to relate all communication from you to your brother.