20 Mind-Blowing Facts You Never Knew About American Dad

13. Hayley Is Seth's Sister

Fox

One for people who've never let momentary curiosity overtake them when they spot Rachel MacFarlane's name pop up in American Dad's credits; with the same last name as series creator Seth, it prompts the question of how she's related to him. Well, Rachel, who plays Hayley, is Seth's younger sister and has in fact been a voice over artist since before her brother broke big.

As evidenced from their interactions in interviews the pair get on incredibly well, but that wasn't always the case; growing up Seth's personality was pretty overwhelming. Thankfully such sibling rivalry seems to be in the past; Rachel has also lent her voice to Family Guy, playing a plethora of supporting characters, most notably Stewie's former fling Olivia.

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Film Editor (2014-2016). Loves The Usual Suspects. Hates Transformers 2. Everything else lies somewhere in the middle. Once met the Chuckle Brothers.