I have three cousins ages 8, 9, and 10 taking care of my 29g, 75g, and 180g tanks back home while I'm away at college. My mom only wants to look at the fish, but wants nothing to do with feeding them/maintaining the tanks.
My cousins, on the other hand, are more than happy to tend to the tanks for $30 a month (I remember when I was their age and $30 was a mountain of money!) I took the time to teach them how to properly feed the fish and perform simple tank maintenance (water changes, rinsing/replacing HOB filter cartridges) and just tend to the canister filters myself during visits home.
No incidents like yours yet (knocking on wood), but I honestly believe that my mom would be more likely than the kids to cause something like that to happen.