With respect, Ed, I'd be trying to wean them off the Xbox and internet while cruising... Under sail there's plenty to do if you get them involved in boat handling and steering. In port there's new friends, beachcombing, maybe dinghy sailing, swimming, fishing, hiking, etc etc.... It's a 3d epic movie all around you 24/7 and it's a great opportunity to 'disconnect' in all the right ways.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)