Need help with account

Hello, the Halo Waypoint account and Microsoft Account I use stems from my main personal Email Account, but I am having problems because the account and gamertag I use whenever I play on the Xbox 360/One came from another family member’s Email/Microsoft Account years prior. Now, I want to keep all my info and be able to go on Halo Waypoint without constant notifications on something unrelated spamming said family member’s email inbox. Is there a way to transfer my Xbox Account from their Microsoft Account to mines?

You want this:

https://support.xbox.com/en-US/my-account/microsoft-account/change-email-sign-in-for-microsoft-account

If you still have issues after, you’ll want to reach out to Xbox Support as this is an Xbox/Microsoft Account thing vs a Halo thing.

Good luck!