Ugh, I don't know how you handle that many kids and have time for anything else. I have a hard enough time with 2 (4 and 8).
Last summer I let my, then 7 year old, borrow my Gameboy SP and he managed to accidentally snap it in half the next day! And his attitude verged on "eh, oh well". Luckily no games have ever been damaged, but we don't let them handle discs for that very reason.