Can other household members join my game without having to purchase multiple copies of same...

The profile will already be separated.

But the games themselves, shared, only 1 user at a time can use.

But you can test it to confirm

I appreciate your understanding, LTNDrgn.

Take the test beforehand, if you get the message that it is not possible, or you suffer a disconnection, then make the purchase =)

Hello!

My name is Dérek, I'm an independent platform consultant and I'm grateful for the opportunity to help you.

LtnDrgn, to share the games, your profile that owns the games needs to be the main one on her console.

Step 1. On the main Xbox One menu, access the panel by pressing the central button on the controller and go to "All settings";

Step 2. Now in the menu, select "Personalization" and click A on "My Main Xbox";

Step 3. Each Xbox Live account can have an Xbox One console registered as the primary device. This means that, on that console, the user of that account will be granted access to all their games and subscriptions for all other profiles, as well as playing their games offline. If your console is not yet registered as primary, click on "Set this Xbox as primary";

Step 4. Please note that by doing this, your Xbox One will be removed from the primary device status of any other account. To confirm, press A;

But remembering, only 1 user at a time can use the game.

I remain at your disposal if you have any further questions.

Thank you very much for the quick response..... I guess I may have to buy her the games so she can play with me

So basically if I'm playing the game on my X series she can't play it on the one series although we are on separate profiles correct?