Arthur· Season 9 · Episode 11Arthur Makes WavesS09E11·April 4, 2005·13m·PBSJames invited D.W. and Arthur to swim at his house. Arthur is shocked to learn that Molly is James's older sister.Streaming on (US) See allSharePreviousAll Worked Up!S09E10NextIt Came From BeyondS09E12Keep going