The last thing any team needs is three friends who only look to pass to each other!
Whatever team they make, hopefully the coach is paying enough attention to bust-up that clique and rotate them in at different times. If he doesn't, then my advice is for the parents to point out to all three boys that their teammates will quickly recognize if they only look for each other ... and then they'll never see the ball unless it is coming from one of their buddies.
I've experienced this on another club team, and it ruined the chemistry and the team suffered as a result.
