If anything, your brother probably caused some damage that won't be covered by the warranty because HE DIDN'T PERFORM PROPER MAINTENANCE FOR THE CAR.
ALWAYS have the brake pads and rotors checked during oil changes. They typically last between 20,000 to 30,000 miles before they need to be changed. If you don't and the brake pads wear all the way down, it will damage your rotors (I'll bet that's what happened).
45,000-mile tire tread wear is normal. Getting new tires after that many miles is part of normal maintenance.
I'll bet your brother probably never bothered to change the grease in the differentials either. They need to be changed every 20,000 miles, ditto transmission fluid.
You want that car to work properly? Stop deferring maintenance!
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