What my colleague has said is true but in order for an arrest to be legal there must be some probable cause to believe that a crime was committed and that you committed it. If there is none, you may be able to defeat these charges early on, assuming you have a competent defense attorney.
The general rule is that the prelim has to take place w/i 10 days of the arraignment and conclude within 60 days of same. A defendant can waive either or both deadlines meaning he will get a prelim one day but who knows when. There are also exceptions to these rules. If your brother's attorney is in trial on the prelim date the judge can find there is good cause for a continuance.
If your name is on the calendar in my county (SF) it means the DA may have filed charges against you. It certainly means you have to go to court to find out. There are always a few no files on the arraignment calendar without case numbers. Bear in my mind that if you get a date to appear and it's a no file it can still be filed w/i the SOL.