While attempting to get Maggie to say her first word, Marge tells the story of Lisa's first word. In 1983, Marge, Homer and Bart are living in the Lower East Springfield district and Marge announces that she is pregnant. She and Homer decide to move into a house to support their bigger family and move into their present day home. Lisa is born during the 1984 Summer Olympics and Bart immediately becomes jealous of her. He tries several things mean things to her, but only manages to get himself in trouble. Bart decides to run away, but Lisa says her first word: "Bart". Bart discovers that Lisa loves him and embraces her as his sister. In the present day, Homer puts Maggie to bed, saying he wishes that she will never talk. Once he leaves, Maggie says her first word: "daddy".
Guest star: Elizabeth Taylor.