When you create a family group, you can manage privacy and online safety settings for family group members on Xbox One, Xbox Series X|S, the Xbox Family Settings app on mobile devices, and Windows PC.
Any organiser in the family group can add new members to the group. To add a member, follow the steps on this page.
READ MORE   :   www.microsoft.com/link
 
Note that if the person you’re adding to your family group is already part of another family group, they must be removed from the current family group before following the steps on this page. 

Sign in directly on the Xbox console

Using a Controller

  • If no one is signed in, select Add new and follow the on-screen instructions.
  • If someone is already signed in, go to Profile & system, select Add or switch, and then select Add new. Follow the on-screen instructions.
You can sign in directly on the console using your controller to enter your account information.
READ MORE  :   www.microsoft.com /link

How do I find out what Microsoft account is linked to my Xbox?

Go to Settings > Account. Scroll right to Your Information, and then select Account Security. The Microsoft account that’s associated with your Xbox gamertag is shown on the right side of the screen.