My brother has not paid money from probate of mother's will. What recourse do I have

Call the Surrogate's Office of the county in which the will was admitted to probate.  Get a copy of the probate file to see what documents are on file.  If the will requires an accounting be provided, write to your brother and demand and accounting.  He can be removed as the executor and someone else can be appointed to determine what happened to the estate assets.  If you live in Ocean or Monmouth counties feel free to give me a call and we can discuss this.