Hi there. Did bunnies fight before they were neutered? Becauuse if they did then neutering won't probably stop that. To be honest I am not sure if your 2 boys will ever get on wiith each other. Most brothers start fiighting at 14 weeks and you are very lucky when brothers don't fight as it is not the norm. I am very sorry I know how you feel. I have just had to separate mother and daughter. Rabbits have some strange ways - but we love them!