Wedding party duties: Ring Bearer
The Ring Bearer, traditionally a small boy and like a Flower girl he is aged four to eight, he walks down the aisle just before this cute little lady, carrying a pillow with two rings tied to it. Well, these days the rings are usually fakes, because no body wants kids to carry around expensive rings, and usually the real one are with the Best Man, but if you trust the specific boy you can give him the pillow with real ones just a little bit before he has to walk down the aisle.
Whatever you choose to have the Ring Bearer carry, be sure he’s told about his duties ahead of time. And definitely, like the Flower girl, they can be included in pre-wedding activities such as the rehearsal dinner just to make it easier for him while he walks down the aisle all by himself with a hundred people watching, because seeing familiar faces will not come as such a big shock.