Undeck the Halls" is the name of the tenth episode of the ABC series Modern Family. It premiered on ABC in the United States on December 9, 2009. The episode was written by Dan O'Shannon and directed by Randall Einhorn. Claire and Phil threaten to take away Christmas when the kids get in trouble; Cameron and Mitchell take Lily to get her first picture with Santa.
Fred Willard makes an appearance as Phil's dad as the family shows Grandpa the Christmas decorations via webcam. Discovering a burn mark on the arm of the couch, Phil and Claire draw the conclusion one of the kids was playing with matches or possibly smoking a cigarette. Phil, as usual, reacts in an extreme manner, threatening to take Christmas away for everyone if no one confesses.
Jay introduces Manny to some Pritchett Christmas traditions, such as watching Miracle on 34th Street. However, Gloria and Manny want to incorporate some of their Colombian practices into Jay's holiday traditions, including practical jokes and fireworks. Jay doesn't react very well.
Meanwhile Cameron and Mitchell take Lily to the mall for her first picture with Santa, however this Santa isn't very jolly. Complaining to management, they are responsible for getting the guy portraying Santa fired. Feeling guilty, they take him home to share dinner - with nerve-wracking results.
In its original American broadcast, "Undeck the Halls" finished 23rd place in the weekly ratings with 9.66 million viewers and ranked 11th in the 18-49 demographic with a Nielsen rating of 3.8. The episode was the 6th highest rated show on ABC in overall viewership for the week, and was second in the 18-49 ratings for the week (following the Disney special Prep and Landing). Robert Canning gave it a 8.6/10 saying it "set the bar for hopefully many more Christmas episodes to come" saying the most fun came from Cameron and Mitchell's subplot and says he looks forward to more Christmas episodes.
Jay gets pressed for a Columbian Christmas, Phil and Claire plan on cancelling Christmas unless the kids cop up to a mystery crime and Mitchell and Cameron get a skinny Santa fired and beat up a chorus of carolers.