I want to play call of duty 4 w/ xbox 360 live with my son on free for all is it possible if it is how is it done?

You start the game and then send him an invite to the free for all. 

we only have one xbox will it work and on freeforall xbox live??

no, sorry man, you gotta have 2 xboxes, 2 live accounts, and 2 Cod4's. capitalism at its best

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All microsoft seem 2 do is rob the innocent people

Aint nothin like a little truth to start your day!