if the parents found out that his/her child lost interest and not practicing piano and they don't want to waste your time? do you still want the child continue lessons?
If it's obvious that the child does not practise and has no interest in playing piano, simple answer: stop the lessons!
can't really listen to the kids on whether they want to play the piano if they're too young. A lot of kids didn't enjoy practicing when they were little and regreted for giving up later on...
Would kids go to school if they were given free choice?
So would this free approach work for learning music?