"Undeck the Halls" is the tenth episode of the first season of the American family sitcom television series Modern Family and the tenth episode of the series overall. 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. Fred Willard guest stars as Phil's dad, Frank Dunphy. The episode received positive reviews from critics and had a 3.8. in the 18–49 demographic.