 The tensions between Arthur and his four-year-old sister, Dora Winifred "D.W." Read, are a common theme in the "Arthur" series.Arthur is constantly pestered by D.W., and she usually tries to get Arthur into trouble, which occasionally causes Arthur to retaliate.Despite that, Arthur tries his best to ignore D.W.'s annoying antics most of the time and often does her favors - sometimes at his parents' request and against his will.