I think we got them at Walgreens and that they’re called something like “Travel Eze.”
You could also listen to an audio book and if your siblings don’t want to listen to it, you might try listening to it with headphones or an iPod or other such things.
“'One should never,' said Fenworth, sternly, 'transport any monster in the confines of an egg shell. Being cramped like that makes it cranky.'” -- Donita K. Paul,