My rule is the parents are to apply sunscreen before arriving and we go out first thing in the morning. I don't ask if they did or didn't and just assume . We are out from 7:30 to 9:00 so in the grand scheme of things likely ok without it anyways but the fact they are brothers does make you wonder. I reapply after nap when we go outside again. They may have started putting it on each other and no one checked to be sure they actually got it in all the right places.