<P> The Graces bring Lucinda back to the house, showing her the repairs being made to the house in the aftermath of the goblin attack and reintroducing her to Thimbletack, who is alive . Suddenly, the Sylphs appear, bringing Arthur, as he was allowed to visit his home since the book was now safe . He cannot remain outside of the fairie realm, or he will turn to dust . Lucinda asks to be taken with him instead; the Sylphs transform her back into her six - year - old self and spirit the two away as the Graces watch and then resume their normal lives with Thimbletack, Hogsqueal, and the Griffin . </P> <Ul> <Li> Freddie Highmore as Jared Grace and Simon Grace <Ul> <Li> Jared Grace, a young boy with anger problems and is the most reluctant about moving from New York . </Li> <Li> Simon Grace, Jared's identical twin brother and a pacifistic animal lover . </Li> </Ul> </Li> <Li> Sarah Bolger as Mallory Grace, Jared and Simon's older sister . </Li> <Li> Mary - Louise Parker as Helen Grace, the children's mother . </Li> <Li> Nick Nolte as the voice of Mulgarath, an evil shapeshifting ogre and the leader of the goblins . </Li> <Li> Ron Perlman as the voice of Redcap, a vicious and grouchy goblin general, and Mulgarath's right - hand minion . </Li> <Li> Andrew McCarthy as Richard Grace, Jared, Simon, and Mallory's divorced father . </Li> <Li> Joan Plowright as Aunt Lucinda Spiderwick, Arthur Spiderwick's daughter . <Ul> <Li> Jordy Benattar as Young Lucinda Spiderwick </Li> </Ul> </Li> <Li> David Strathairn as Arthur Spiderwick, the author of the guide and owner of the mansion . </Li> <Li> Seth Rogen as the voice of Hogsqueal, an unintelligent bird - eating hobgoblin who seeks revenge against Mulgarath for killing his family . </Li> <Li> Martin Short as the voice of Thimbletack, a loyal house brownie who shapeshifts into an aggressive boggart when he becomes angry . </Li> <Li> Tod Fennell as Helen's co-worker </Li> </Ul> <Li> Freddie Highmore as Jared Grace and Simon Grace <Ul> <Li> Jared Grace, a young boy with anger problems and is the most reluctant about moving from New York . </Li> <Li> Simon Grace, Jared's identical twin brother and a pacifistic animal lover . </Li> </Ul> </Li> <Ul> <Li> Jared Grace, a young boy with anger problems and is the most reluctant about moving from New York . </Li> <Li> Simon Grace, Jared's identical twin brother and a pacifistic animal lover . </Li> </Ul>

Who plays simon grace in the spiderwick chronicles