Hayley Smith (American Dad!)

Hayley Dreamsmasher Smith (born May 8, 1987) is a character from the animated television series "American Dad!". She is voiced by Rachael MacFarlane, the younger sister of one of the series co-creators, Seth MacFarlane.
Hayley, along with her father Stan, was one of the first two characters that were thought of and created for the series. 
During the series, Hayley's storylines is usually about her liberal opinions clashing with her father's staunch conservative beliefs, and her on-again-off-again relationship with boyfriend Jeff Fischer, whom she later marries in the show's sixth season.