As it turns out, Alex and Kate are two highly mischievous brats who vie for their often-too-absent father's attention by wreaking havoc in the household via elaborate and rather vicious pranks and booby-traps, with their specialty targets being the nannies he has assigned to take care of them (Alex Sr. is a widower). Sean witnesses the last nanny jumping into the fountain in front of the house to extinguish the fire in her hair. However, their father proves to be either too distracted or too lenient, which causes the children to continue their schemes. Thinking that he is a new (albeit unusual) replacement, they find a new target in Sean. But after one prank too many, which involves a swimming pool full of red dye ("the Pit of Blood"), Sean finally exerts his authority and not only gets to quiet Alex and Kate down, he also manages to open the eyes of their father to his family problems, as well as bonding with the kids and managing to help them sort out problems of their own.