That's a tough one Chris1234!
10 is very young to be able to deal with those sorts of dynamics.
To be honest, I think the best thing you can do is sit and listen to the kids and Praise every time any of the boys appreciates any of the other boy's ideas. Soon you'll get them competing to see who can be the best listener/appreciator.

Maybe soon is too optimistic, how about eventually?

Love and more Love,
Grinity

Coaching available, at SchoolSuccessSolutions.com