Let them work it out, make arrangements to permanently seperate them, or cull/relocate two of the three. Each wants to be dominant to assure that his DNA carries on. You are describing normal rooster behavior.
If the roosters grow up together and no hens are involved they'll usually get along. Can you leave the rooster you want to do the deed with the hens and put the rest in another pen?
One of my rooster flocks.
They would have mock battles but no fights and at night they would get into a big pile.