18-year-old Hayley is the ultra-liberal daughter of the Smith household. Stan insists on putting her through an airport-style security search every time she enters the house (sure, he loves his little girl, but he doesn't necessarily trust her).

Rachael MacFarlane is not just the younger sister of FOX's billion-dollar animation brain, Seth MacFarlane. She is also one of the most accomplished voice-over actresses in Hollywood today. In addition to AMERICAN DAD, she provides the voices for various characters on "Robot Chicken"; "Mindy" and "Eris" on "The Grim Adventures of Billy & Mandy"; and "#362" on "Codename: Kids Next Door." MacFarlane also has sung on many animated series as the voices of Barbra Streisand, Christina Aguilera, Madonna and Celine Dion, among others.

MacFarlane grew up in Kent, CT, with her mother, Perry; her father, Ron; and her brother, Seth. She lived on the campus of an all-boys private school where her father was a teacher, as well as a singer who performed in community centers. As a girl, she occasionally would duet with her dad on songs such as "Marblehead Morning" and "You've Got A Friend."

After dinner, singing on the back deck of the MacFarlane home had a great influence on the young girl's studies. It was here that she listened to her father and mother harmonize on songs of the '60s and '70s by groups such as Crosby Stills and Nash and Simon and Garfunkel. She was also very involved in community musical theater, appearing in Gilbert and Sullivan operettas and starring as "Audrey" in "Little Shop of Horrors" and "Nancy" in "Oliver." She played French horn in her high school band and sang both in the school and church choirs.

In 1998, after graduating from the Boston Conservatory where she studied voice, acting and dance, MacFarlane moved to New York to hone her craft. After a year and half of auditioning and earning a living as a nanny for a famous Broadway producer, she decided to vacation in California - where her brother had settled, and where he was experiencing the beginnings of his great success. That was in 1998, and she still has the return ticket to New York.

MacFarlane's first big voice-over role came during the first season of FAMILY GUY, in which she was cast as "Jennifer, the Cult Girl." That triumph was quickly followed by roles in "Johnny Bravo," "The Power Puff Girls," "Dexter's Lab" and "What's New Scooby Doo?."

In September, MacFarlane will release her first CD, "Hayley Sings," comprised of songs that "Hayley Smith" will sing on AMERICAN DAD, as well as songs that "Hayley" might choose to sing, given her character and personality on the series. She is a child of the '60s and '70s living in the 21st century, and her music idols include Carole King, Paul McCartney and Paul Simon, among others. MacFarlane has re-envisioned some of the great standards written by "Hayley's" music heroes, and made them into unique new standards for the iPod generation. The influence of both her parents can be heard in every note she sings.

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