The Dunphy kids faces every child's worst nightmare: catching their parents having sex.  Meanwhile, Mitchell and Cam's plans to befriend a restaurant owner backfires on the new January 19 episode of Modern Family.

Below are five sneak peeks and a synopsis from ABC.

ALL-OUT TRAUMA SETS IN WHEN THE UNTHINKABLE HAPPENS -- THE KIDS WALK IN ON PHIL AND CLAIRE -- ON ABC'S "MODERN FAMILY"

Rachael Harris ("The Hangover," "Best in Show") Guest Stars

"Caught in the Act" - Plans backfire when the kids go to surprise their parents with breakfast in bed on their anniversary, only to catch Phil and Claire in a compromising position. Meanwhile, Jay and Gloria's Vegas getaway is thwarted by a brutally honest email that was accidentally sent to Claire, and Mitch and Cam desperately try to get an "in" at the hot new neighborhood restaurant whose owner happens to be a mom (played by Rachael Harris) at Lily's preschool, on "Modern Family," WEDNESDAY, JANUARY 19 (9:00-9:31 p.m., ET), on the ABC Television Network.

"Modern Family" stars Ed O'Neill as Jay Pritchett, Julie Bowen as Claire Dunphy, Ty Burrell as Phil Dunphy, Sof’a Vergara as Gloria Delgado-Pritchett, Jesse Tyler Ferguson as Mitchell Pritchett, Eric Stonestreet as Cameron, Sarah Hyland as Haley Dunphy, Nolan Gould as Luke Dunphy, Ariel Winter as Alex Dunphy and Rico Rodriguez as Manny Delgado.

Guest cast includes Rachael Harris as Amelia and Munda Razooki as Counterman.

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