The Simpsons Season 8 Episode 17 - My Sister, My Sitter Episode Title:My Sister, My Sitter.Episode Description:Lisa wants to start babysitting, but Marge thinks she is too young. Flanders urgently needs a babysitter and Lisa gets her first job. When Flanders gives her a glowing review, she starts to get steady work. Then one evening, Lisa is put in charge of babysitting Bart and Maggie. Bart is outraged and embarks on a series of pranks. When Bart refuses to go to bed, Lisa accidentally knocks him down the stairs which dislocates his arm. Lisa tries to help him by transporting him in a wheelbarrow to Dr. Nick. Bart falls out of the wheelbarrow and rolls down a hill. The townspeople are mortified, but Lisa continues to get jobs the following day.