Do I need to buy two copies of the same game

As you have the digital only console you would need to purchase a digital copy of the game. When you purchase the game on disc the media has to be in the reader to play the game. With disc based purchases you can only use it on one console at a time they
would not be able to play the same game at the same time; disc has to be in the reader.

If you had purchased the game digitally you can game share in the same household with the home console feature. I highly suggest you start buying games digitally from now on.

Having your Xbox Once console set as you home Xbox will allow you to do the following:

• Share games and downloadable content purchased from the Microsoft Store with anyone who signs in on your console. You can also share games downloaded as part of a subscription.
• Share your Xbox Live Gold subscription with anyone who signs in on your console

The first time you sign in on an Xbox One console and save your password, that console will become your home Xbox. Keep in mind, you cannot designate more than one Xbox as your home Xbox. You can share purchased games and your Xbox Live Gold membership with
other users only on your home Xbox.

How can I designate an Xbox One console as my home Xbox?

You can designate an Xbox One console as your home Xbox by completing the following steps:

• Press the Xbox button to open the guide
• Select System, then select Settings
• Select Personalization and then select My home Xbox
• Make sure to review the information and then choose Make this my home Xbox to designate the console as your home Xbox. From this step, you can also remove designation by selecting This is not my home Xbox

Keep in mind, when you change home consoles, all device licenses for digital content will move to your new home Xbox. You will not be able to access this content on your old "home" Xbox.

How many times can I change which console is my home Xbox?

You can change which console is your home Xbox console up to five times during a one-year period. To clarify, this period works on a rolling basis, starting the moment you change your home Xbox for the first time.

Unfortunately since the game is on disc and one of the consoles does not have a disc drive, the game would have to be purchased digitally in order to run on that console.

Once it's purchased digitally, that child can set the other child's console as their Home console and share the game with them and you could sell the disc if you wanted. https://support.xbox.com/help/hardware-network/console/my-home-xbox

If you buy your games digitally then you and your son can both play the same game at the same time but if its disc then you need two copies

Digital is excellent for my options but they should be cheaper than physical. With two XboxOnes in my household and Home Gold...and Family feature, I only need to buy one digital copy of the game. Download on both Xbox's and my kids can play the same game
I'm playing at the same time on both consoles...Offline or online..... so in essence i'm getting two games for the price of one. Can't do this with physical copies of the game.

If you are buying the game on disc then you would need to buy two copies however if you buy the games digitally then you only need to buy it once and both your kids can play it even at the same time also both kids can share Xbox live