So the kid at the beginning gets guilt-tripped by Riker for playing a practical joke.
There are several problems with this scenario - if Riker is the one taking responsibility for them being on the ship, then isn't this his fault? Riker puts it all on the older brother. Second, why are children going down to an alien planet, shore leave or not, unsupervised? And most importantly, if there is a plant that is very very deadly, then why are children allowed to roam around freely without any guidance? Don't they usually scan the environment before going down?