I know this is an ancient flash, and you'll probably never read this, but just for boredom's sake: it started off decent enough, but the ending in all honesty made me roll my eyes. It feels forced and disingenuous as can be, and seemed like it was done for the sake of emotional manipulation. We only see just one seizure, then it follows up with that?
Maybe if we saw more of how this person struggled to function in day-to-day life because of his condition. Constant doctor visits, panics, inability to perform menial tasks most of us consider trivial, etc. and we saw how it tore him apart, before reaching that point. Well... it'd still be corny in my opinion, but it would have more of a foundation to it. Plus, they're kids. That is what really makes it feel even more disingenuous.
I think it would have been better to show how someone with the condition may struggle in day to day life, and how it may inhibit and impair them. If the character used has to die, perhaps it could happen during a particularly bad time? Driving, or falling and hitting their head?