I'm looking for some good XBOX live games for my younger brother….he's 10 and i'm trying to lean him away from HALO type games if possible anyone have any suggestions?

The most plentiful type of XBOX live games are sports/racing. Each years offering by EA sports or 2k sports gives you baseball,football,hockey,and basketball online.

Some other notably decent online experiences are:

Forza Motorsport
Midnight Club 3
Star Wars: Battlefront 2(yes its a shooting game..but not gory)
Crimson Skies(an airplane game)
Tony Hawk Underground

Xbox live is very FPS heavy with Halo 2, Tom Clancy games, and others.