Details: Arthur's class is asked to research their ancestors. Muffy and Francine try to one-up each other with who their ancestors were, even after each find nothing interesting. Even though Muffy is eventually caught lying about her ancestors, Francine continues with her lie.

Whether they're facing down the school bully, worrying about a new teacher or babysitting the Terrible Tibble Twins, Arthur, his little sister D.W., and their friends manage to solve their third-grade dilemmas with imagination, kindness and a lot of humour.