Are the forks straight or did they get messed up too? Based on the amount of damage I see and the frame being scratched up I would cut my losses and sell it outright. It would take a pretty adventurous person to want to rebuild that. Not saying it isn't possible.
Honestly, it's really not that bad and wouldn't take much to get back riding!
I still don't understand, if he was hit by another car (and not at fault) then the cars insurance should pay for the repair. If the car was uninsured, then YOUR uninsured motorist coverage would cover the damage/loss even with liability??
Not an expert, the accident is sketchy, doesn't matter.
That bikes totaled. The frame on the clutch side looks damaged and so does the swingarm. Because of the design and material it's not something to mess with. You shouldn't have a big problem getting $2500. Looks like '99 paint on the tailsection. Best of luck, glad your brother lived.
Id part it out. Even if somehow it all got fixed up I wouldn't want to sell that to another rider in good faith. Once the frame is bent its game over. Of course if someone insists on buying it I would disclose everything to them before the sale.