I just figured it out. Under the "my apps and games" you need to "manage" the game. I assumed that the DLC was attached to my account. It was in additional download on the manage page for the game. There were 8 additional items that needed to be downloaded. Once these were downloaded, my son had access to everything like he did before. This works as long as he is on the "home" xbox.
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This worked for me! Thanks