It looks like every Kid rolls once, adding dice for attribute, corresponding skill, and items they may have in their possession.
They get to reroll all the dice that failed by spending a Luck Point, once per test.
And after that, if they have at least half the successes they need to pass the Extended Trouble, they can suffer Conditions for free successes.
Do I have that right?
Also, using Lead to build a dice pool for the other kids instead of contributing successes to the Extended Trouble seems counter-productive, like the leader's time would be better spent doing things instead of leading.