Hi Lin and welcome
our TS forum is here:
http://neurotalk.psychcentral.com/forum25.html
you'll see a sticky thread there too on some of the things we did to help my son who has TS & OCD
http://neurotalk.psychcentral.com/thread1145.html
the Tourette Syndrome Association has some helpful info, booklets etc on education . TS is now legally classified "other health impaired" under the US education act re Americans with Disability so many accommodations are available as well
here is the TSA website
http://www.tsa-usa.org
all the best to you and your grandson. I hope to see you on the TS forum here too