If they searched the right house, despite the typo on the warrant, this is not going to help you. In the course of your brother's search the cops apparently found things in the house that caused them to charge you. 2.9 grams of cocaine and 13 guns? You need an attorney as soon as you can get one.
All three of you should get attorneys as soon as possible. Hire the best crimnal defense lawyers you can find. If any of you cannot afford an attorney, then that person can apply for the services of the public defender.
Your attorneys will look at the warrrant and determine if there is a basis to quash or traverse the warrant or otherwise move to suppress evidence. The Fourth Amendment dose require the warrant to describe the place to be searched and misdescriptions can sometimes lead to suppression of evidence. In addition, if there is a warrant to search for electronics, drugs come oiutside to scope of the warrant. However, if the officers could see contraband in plain view while in places where they were lawfully entitled to be while looking for electronics, then the seizure of the drugs may be legal. This, too, is a question to take up with the lawyers.
They could not arrest you based on a search warrant. However, if they were lawfully in the premises, you entered and they had probable cause to beleive you committed a felony, they could arrest you. There are some nuances here so, again, take it up with your lawyer. All in all, you are facing serious felonies and a life changing experience if you are convicted.
Talk to the lawyer and good luck!
I agree with my colleagues. Either hire a lawyer now or call the public defender and see if they'll provide you some meaningful advice and service before court. If they can't or won't, clam up until you meet with them in court.