Sibling Thing on 'Relative Madness'

Bart Simpson (voiced by Nancy Cartwright) and Lisa Simpson (voiced by Yeardley Smith) are usually at the center of the Simpson adventures. Bart is a rebellious problem child who hates school and loves trouble. Lisa is an earnest over-achiever and often acts as the conscience of her family. Although the siblings have little in common and often fight, they always have the other’s back.

Watch SOAPnet's Relative Madness -- It's a Sibling Thing countdown this Thursday night to see if Bart and Lisa top the list!