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THE FUSE FOR THE BRAKE LIGHTS MAY BE LABELED " STOP ". GM USES BRAKE FUSE FOR THE " ABS " HOWEVER, THE FUSES NEED TO BE TESTED WITH A FUSE / CIRCUIT TESTER, IN THE FUSES BOX UNDER THE HOOD & THE FUSE BOX INSIDE THE VEHICLE.
If all of your lights inside and out arent working, then its sounds like an electrical isuue. that cost as much as $1500 dollars. But i would start with checking the fuses in your relay box under the hood. That is usually where the lights fuse is at. Some cars have two fuse boxes and a relay box, one fuse box is inside the car, one is under the hood, and the relay box is under the hood. So i would check the relay box under the hood or fuse box if you can find one. granted your brother checked them all, it sounds to me like an obvious blown fuse... good luck
Check all the brake bulbs first. If that is not the problem check the fuse for the lights. If that does not solve the problem then you will need to replace the brake light switch that is mounted under the driver dash that will be near the brake up toward the top.