I like to call this post "brotherly love"

So i have 3 sons, 2 of them i only see every other weekend and all summer. They are at the age where they fight constantly. What does one do?
I think i came up with a solution. i tried it out today and it seemed to work. They were fighting and i had them stand outside for 5 minutes and hold hands in the front yard. They didn't fight the rest of the day.