From personal experience,there will be soem fighting amongst boys.I currently have a Cochin bantam and. New Hampshire rooster.They fights every spring but nothing serious.Usally a couple fights,no blood ever drawn,and most last a couple seconds.The rest of the spring is just the Cochin bantam antagonizing the other rooster simply by standing in a dominant position as if he wants to fight.The New Hampshire just runs at him and the bantam runs away,after being ran away he resumed back into his fight position with his wings aside and constant crowing till he can get the rooster to chase him again,it’s actually quite hilarious.I have kept a son with father and this only worked out once,trying again for the third time this year.Last time both got along and successfully lived together for a year,for some dumb reason my grandma got rid of the son.My first experience with son and father,went horrible,but that was two different roosters.Father killed son,blinded him in both eyes and sprained his neck,now that was unexpected,unfortunately I had to shoot his son.I have seen better days,that was a terrible experience,escpecially since at the time I was a kid.