Children making use of children
If you plan on having multiple kids, either have twins (or triplets if you insist) or have them 10 years apart.
The trend among our children now is for them to send the youngest (currently Amber) out on a suicide missions to tickle their parents, poke strangers or harass one another. They still occasionally do the dirty work themselves, but the call of "Amber, tickle Ge Ge" and "Amber take Jie Jie's book" ring out louder and more frequently these days. Outsourcing at work.
It all makes for interesting observation on how children interact. In this large scale experiment, we've watched harmless little babies grow into unsteady toddlers and now into cunning schemers capable of turning unsuspecting others into deadly weapons of mass destruction.
Amber, in turn, we suspect is to innocent victim. She is pretending to be ignorant of the instructions, but silently enjoying the fruits of her destructive behavior, without having to assume the full responsibilities.