I have three children at the same school — is that three accounts?
One account. Every child in the same family appears inside it, each with their own schedule, attendance, remaining sessions, and invoices. A child enrolled in more than one class gets a separate card per class.
If the school switches on family consolidation, the three children's recurring invoices arrive as one sheet per branch; if not, it stays one invoice per child. Either way they are paid from the same portal.