Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Based on your description, the child account is still linked to the original Microsoft Family group that is managed by your first Microsoft account. Since only the family organizer can remove a child account from a family group, access to that organizer account is typically required before changes can be made. Unfortunately, as community moderators, we do not have access to Microsoft accounts and cannot view account details, verify ownership, reset passwords, recover accounts, or make any changes on a user's behalf. For privacy and security reasons, we also do not have any tools that would allow us to intervene in the account recovery process. If you no longer have access to the original account, I recommend filling the Microsoft Account Recovery form since it is the only way to activate the process:
My sincerely apologize that we cannot provide more direct assistance in this situation. I know how concerning account security issues can be, and I hope the guidance in the article helps you regain access to your account as quickly as possible. Wishing you the very best with the recovery process.