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Hello @Hamza Karaca
I’m sorry you’re dealing with this. Only a family organizer can normally remove a member. If the organizer account is inaccessible, first try recovering it through the Microsoft account sign-in helper.
If recovery is not possible, contact Microsoft Support , type in Live chat and enter - select Ask our Support Assistant and select Contact Support - choose Products and services as Microsoft and Office 365 - Category as Billing and Account Profile questions. Once connected, explain that the family organizer account cannot be accessed. Support may need to verify the affected accounts and escalate the case to the appropriate account team. Please note forum moderators cannot manually remove an account from a family group.
Thank you for your understanding and time