<Tr> <Th> Children </Th> <Td> </Td> </Tr> <Tr> <Th> Relatives </Th> <Td> Seth MacFarlane (brother) </Td> </Tr> <P> Rachael Ann MacFarlane Laudiero (born March 21, 1976) is an American voice actress and singer best known as the voice of character Hayley Smith on the animated television show American Dad!, which was co-created by her older brother Seth MacFarlane . She also voiced Supreme Leader Numbuh 362 in Codename: Kids Next Door and Kate Lockwell in Starcraft II . </P> <P> In addition to voice acting, MacFarlane has also been involved in other aspects of animation, such as being a production manager for The Grim Adventures of Billy & Mandy and Welcome to Eltingville and she wrote an episode of The Grim Adventures of Billy & Mandy, titled "Educating Grim". </P>

Who plays the voice of hayley on american dad