I personally have no experience with this topic, but based on my knowledge of how game libraries are handled on Xbox, I THINK this is how it works:
Option 1: Add your account to his Xbox. He will need to be logged on to Xbox Live as you to play your games. You will not be allowed to both be logged on to Xbox Live at the same time, so if you are connected on your "home" Xbox and he logs on as you, you will be logged out. You should not be required to be connected to the internet in order to play your games on your Xbox. Theoretically I think you could play a game offline and he could be logged into Xbox Live and you would have simultaneous access to the same game library.
Option 2: Set his Xbox as your "home" Xbox. He will not be required to be connected to the internet to access your games on his Xbox, but you will be required to be connected to Xbox Live in order to have access to your library. This is basically just the inverse of option 1.
Like I said, this is just my educated guess on how it works, so please do not take this as gospel. If a console is designated as your "home" console it does not require to be connected to the internet to access your game library. But if your account is on an Xbox other than your "home" console, it needs to be connected to the internet to access that account's game library. Based on that, I think the options I described above would work, but I do not know for certain as I have never tried it myself.
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