American Dad Season 6 Episode 3 (American Dad s06e03) with title “Best Little Horror House in Langley Falls” aired on Sunday, November 7th 2010 at 09:30 pm via FOX Network.
Here is summary for American Dad Season 6 Episode 3 :

Stan and Francine have had the scariest haunted house on the block for eight years running, but when one of their neighbors provides some stiff competition, Stan ups the ante with a “killer” set-up. Meanwhile, Steve falls head over heels for his overprotective friend’s younger sister and competes to win her heart in a Halloween showdown.