sorry i have no experience with this, i just have one female. Brothers will be brothers…thats one way to look at it. I think (and others will disagree) that you should neuter unless you have a dog that has perfect genes for breeding. This may help with the aggression. If you neuter one, I'd neuter both. And make sure that they are both at the bottom of your pack, and you're the leader. Start making them sit or paw before getting fed. Try to identify the trigger for their fights and authoritatively stop them at that instant, make them sit and stay. Its important to have control mentally over the two dogs when they are in the same room. soo. others may chime in sorry I don't have more advice.