Good... good response...

You can also say "This is the class... the homework comes AFTER we LEARN what the homework IS..."

OR

"You have to SHOW UP in CLASS to GET the ASSIGNED HOME WORK silly..."

OR

"This is a class just like our kids take every day. We are going to set an example here... Cutting class because you don't want to go? NO. We are going for our children's sake and our own."