Forge Relationship
Doing things together strengthens guys friendship. The boys could go either to the host child’s room, out in the yard or do a planned game. nerf gun battle, legos build-off, dangerous book for boys board game, are just some jumping off ideas. Play should be guided to one particular activity so kids develop relationship through shared experience and don't separate into individual play. Older guys could work on a group building project. You'll provide the direction, they'll bond through shared activity.