<Tr> <Th> Relatives </Th> <Td> Jack Smith (paternal grandfather) Betty Smith (paternal grandmother) Hercules (paternal step - grandfather) Rusty (paternal half uncle) Nicholas Dawson (biological maternal grandfather) Cassandra Dawson (biological maternal grandmother) Bàba (adoptive maternal grandfather) Māma (adoptive maternal grandmother Gwen Ling (adoptive maternal aunt) </Td> </Tr> <Tr> <Th> Nationality </Th> <Td> American </Td> </Tr> <P> Steven Anita "Steve" Smith is a fictional character in the animated television series American Dad!, voiced by Scott Grimes . He is Stan and Francine Smith's only son and Hayley's younger brother as well as the youngest of the series' six main characters . </P> <P> Steve only has 3 human friends that always stand by his side no matter what crazy scenario is going on . However, he has the biggest bond with Roger because they are always going from one crazy adventure to another . They even made a fake detective agency where they even came up with their own nicknames . Steve is "Wheels" and Roger is "The Legman". </P>

Who does the voice of steve on american dad