Estate Law Questions? Ask an Estate Lawyer.
The executor (brother) has an obligation to send you the money as part of his duties in administering the will through the probate proceeding.
You can follow the probate court matter by checking with the local county court (probate division) and see what the status of the case is (this is likely where you already saw this earlier in your "already tried" portion).
If this is a great deal of money, or if you are worried that the executor will fail to perform as he is supposed to (he will not send your money), then you may want to consider retaining a lawyer to send a demand letter on your behalf.