The one at the back is thinking: “just you wait, I’ll get my own back” 😛
Kittens will get everywhere as they are insatiably curious about their surroundings. It’s part of a cat’s nature and the phase will pass but until then be prepared to get them off the top of kitchen cupboards; wardrobes; out from beneath the kitchen sink waste; off the top of curtain rails.
Give them a litter tray that’s in a quiet location, they’ll soon use it in preference to anywhere else in the house. If they are sleeping then let them sleep, don’t let the kids continually pester them they’ll become highly strung and not particularly sociable otherwise. (The cats that is, no idea about your kids 😀 )