If Iwere going to start my grandkids out on something, I'd try a .09 or larger plane with a easily built up wing. They are fun to build, easy to fly and forgiving in a crash. Testors and Guillows both had great designs, though the Testors Sophomore was my favorite; three sizes....09 to .29. The .29 had a solid sheeted wing. Here's the thread...http://www.rcgroups.com/forums/showthread.php?t=1250942
Teach 'em well!