The Family fee is a PER CLASS fee that will be charged each time a family registers.
For example is the Jones Family signs up 3 children for Session 1 at the same registration time they will be charged this one flat fee. But if they later decide to add another child they will be charged again. The system does not track if a family has already paid this.
This is different than the annual per family registration fee defined in the Lessons System tab.
Lessons: Annual Registration Fee per Account / Member