When the kids fall sick
When one child falls sick, typically the others will begin on that slow chain reaction which will leave your household crippled in a tangled and complicated web of sleeping arrangements, food purchases and send-and-pickup scheduling chaos.
Typically one child would be on the road to recovery while another has just started showing symptoms. A third could be perfectly fine while a forth might be pretending to be sick so he or she could escape drinking Milo in the mornings. Some routines would still have to be stuck to for the unaffected, like working, going to school, ballet lessons, leaving the others stranded at home without access to clean water or acceptable nourishment.
Your vehicle petrol consumption would likely increase along with your electricity and water bills.