Hm... Now that they are seven weeks you might witness small fights of which are considered 'challenging.' Challenging is something that almost all cockerels will do if you have more than one when they are younger.
Sadly, you might not know until they are fully matured or at least fully grown how their temperament will be. Once they are almost mature enough that they stop challenging... Dominance may take place.
They will develop to the point that they have their hackle feathers as a example, dominance when it comes to hens will start... The dominance won't be terribly rough although might be intimidating. It's more like they are showing each other who's boss and who's the one who has the hens.
Finally. They are fully grown and fully matured... They might begin getting a bit too rough. That's the hard part. But I don't want to make your mind think that they will most certainly be rough, they may not, but I just want you and your flock prepared in case.
Dominance sadly takes place in all flocks if they have two roosters... But you can control dominance a bit. You cannot control something extremely worse than dominance.
I hope this helps even the slightest of all bit. Good luck and God bless on your journey. Best wishes and I hope that your flock works how you'd like.
-Angry Hen
Another thing, the best you can do is spend time with them and break up any signs of fighting. But it will take time for you to figure out what they'll be like.