Seriously?
Was this before or after they had started taking classes?
Both. More often it's before, because we're quite up front about how the program is run. But it happens later, too. I can think of one parent who was upset because their child wasn't being promoted. I pointed out that it was obvious that the child was not practicing at home, that they just sort of coasted along in class with minimal effort, that they missed as many classes as they attended, and that they didn't know the material for their rank.
Interestingly, about 18 months later the kid came back, but with their other parent (custody had apparently changed) and is doing just fine.