In the film War of the Worlds , Rachel is the daughter of Mary Ann .
His former wife , Mary Ann ( Miranda Otto ) , later drops off the children , 10-year old daughter Rachel ( Dakota Fanning ) and teenage son Robbie ( Justin Chatwin ) , at Ray 's house in Bayonne on her way to visiting her parents in Boston .
War of the Worlds -LRB-2005 film-RRB-