your brother have to paid them back somehow. will not go to court, but if your brother not paying them. His credit will be reported as late and will not be able to do lending again. ex. buy a house, car...
you can arrange with those credit card a way of payment or go to a bank and ask for a consolidation loan before its too late. a couple of thousand isn't too bad yet, start early and paid them back before it is really too late.
QQH me for consolidation loan if interested.