Hi there, Thanks for reaching out. Since March 25th's [url=https://help.bungie.net/hc/en-us/articles/35597981889300-Notice-Bungie-net-Account-Unlinking-Update-on-March-25-2025]unlinking update[/url], only Twitch accounts are now eligible to be unlinked from Bungie profiles. All other platform accounts, once linked, are linked permanently. Further, as Bungie entrusts players with the security and management regarding linking their accounts, we do not unlink any accounts on players' behalf. Thus, your brother's Xbox account will remain linked.