For a child that is 11 years old, we offer the Grommet Freestyle Camp lessons. It is offered at a packaged price, and the ticket is non-transferable so I'm afraid I have to say no to your vouch question.
You can find more information about the Grommet Freestyle Camp here:http://www.mthigh.com/mthigh/school/childlessons.html
Another option you can choose is a private lesson, which is priced solely for the lesson only and does not come with a lift ticket.
Find more information on private lessons here: http://www.mthigh.com/mthigh/school/private.html
I hope this information helps!