I know the episodes have been shot
But here are a few suggestions
Tie a plastic bucket of water atop a doorway with the rope going behind the door
Anytime Santoshi Simmi Param pass under be sure to tilt it and drench the 'stupids'
Puncture all the Bhalla cars
Cut all Santoshi's chunnis into half
Cut all senior Mr Bhalla's kurtas so that they end near his waist
Put thorns below Simmi's and Param's bed sheet on which they sleep
Take out all the washers from their faucets so once they turn the tap on they cant turn it off
Introduce a family of synthetic lizards etc in into Mihika's room so that she screams with freight
In short keep them busy till such time sense prevails
They need to be in constant chaos
They need to be constantly preoccupied with personal inconveniences caused by deliberate mischief