3 Xbox’s same household. Is it possible to all share mw2 or other games

Activision also blocks sharing the game, at least the DLC

This is their right as the publisher.

You would need to purchase the game on at least 1 more account in order to share across 3 consoles.

• No, Xbox does not allow you to game share with people outside your household. Game sharing is a feature that allows family members or friends living in the same household to share games and Xbox Live Gold memberships on one console. Sharing your games or memberships with people outside your household violates the terms of use and could result in account suspension or other penalties.
  

Only one can use Xbox Game Pass. You can however share the games that are on Xbox Game Pass with someone else using the Home Xbox setting on the console.

Bear in mind this feature can only be used in the same household if there is more than one console in it. Sharing games to other users in other households is against the terms of use, and can get you suspended or banned for doing it.

You can only share games in the same household on one console. If you share games to another household, then you are basically breaking Xbox rules, and can be suspended or banned for doing it.