Every parent - well, those whose kids are of a certain age, anyway - knows the awkward nervousness that comes after your child asks that dreaded question: "Is Santa Claus real?"

On the premiere episode of Life in Pieces, CBS' new sitcom about a family struggling with everyday problems in different ways, Heather (Betsy Brandt) and Tim (Dan Bakkedahl) face that exact issue, when one of their daughters lets it slip to her younger sister that Santa Claus is made-up.

That, of course, spirals into an existential crisis, with their young daughter questioning the existence of everything from the Easter Bunny to - gulp - God.

Fall TV Preview: Get scoop on Life in Pieces and other new shows

Check out the exclusive clip above.

Life in Pieces premieres Monday, Sept. 21 at 8:30/7:30c on CBS. Will you watch?

(Full disclosure: TVGuide.com is owned by CBS.)