In British Columbia, a judge has decided that the waivers which parents sign when enrolling their kids in MA have no weight, and that the kids can still sue the instructor if injured. Here's the link:http://www.cbc.ca/canada/british-columbia/story/2009/10/09/bc-children-waivers.html
It was ruled that under the Infants Act of B.C., a parent cannot sign away a child's right to sue for negligence.
What is the situation in your region? How can kids be protected against negligent instruction while at the same time good instructors be protected against trivial litigation that can put them out of business?