If they are hiding from their chores, maybe they shouldn't have told their dads where it was.
Looks like a happenin' place!(I like how you've merged your cartoon with that photographic background, J.B.) - good stuff! :)
It might help if they camouflage it. Or maybe they can get Harry Potter's invisibility cloak.
It's a real kids palace. If their Dad's helped build it they will know where they are hiding...Time to up & move it. Maybe their Dad's can help with the move too
Does it have internet? Does it have video games? Or is it one of those rustic club houses?