Mystery

Source: American Dad!
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Hayley Smith is Stan and Francine's new-age hippie daughter. Despite being a married adult for much of the series, she still lives under her parents' roof along with her husband, Jeff. As revealed in the episode "The Kidney Stays in the Picture", she may or may not be Stan's biological daughter—Francine revealed to have cheated on Stan at a bachelorette party.[15] Nonetheless, Stan still regards her as such.[15] One to stand up for her beliefs, Hayley is passionate, insistent and vocal in her convictions. In mentality, she's portrayed as a Liberal, what was originally intended to be the antithesis to her father's ultra-conservative mentality. These character traits were particularly emphasized in the show's beginnings but heavily toned down afterwards.[22] Intuitive and insightful, Hayley is able to instinctively grasp the hidden, inner, and obscure nature of situations. As examples, instantly upon entering the room in the episode "Finger Lenting Good", she realizes what Stan and Steve are up to in trying to get Jeff to hug them so as to lose his finger for engaging in his [Jeff] vice.[21] As another example, in the episode "Da Flippity Flop" when the essence of Klaus has entered Stan's body and taken control over it, he attempts to deceive Hayley and Francine into thinking he's truly Stan; however, Hayley instantaneously and halfheartedly acknowledges that it's Klaus.[23] At times, Hayley can be casually rude and insulting in attitude especially towards her brother, Steve, which can be described as sibling rivalry. Several story arcs have been used with regards to Hayley's romantic relationship to Jeff. Back when the two were dating, they had several breakups.