Crazy!!!

So I'm now babysitting one of Bryant's friends on Tuesday and Thursday "All Day", the little boy tells me when he leaves, "see you Tuesday All Day"; anyway I think it's kind of cute. But I think some days I'm going to kill Bryant. His little friend is fine but Bryant is totally going through this power struggle thing and fights with him over just about everything. I want to let them have there little fights so they can learn to deal with conflict but I'm not sure how else to help him over come it? Please, I know most of you reading this have dealt with this because, you either have 2 or more kids or have boys, and lets face it boys just like to fight; let me know what you have done or would do in this case.