Jack Carter, a man constantly living in a state of regret, takes his technology-obsessed family, including their lovable dog Buster, on a Christmas vacation to the mountains in the hopes of reconnecting with them. While on vacation, Jack and his family run into an estranged, uber-competitive friend of Jack’s, who now lives the life of luxury Jack pines for. Through a series of juvenile competitions, Jack realizes that the love of his family is more rewarding than anything money could buy.

Sharron Holden is a loving mother, wife, and workaholic. She’s on the verge of a huge promotion at work, but her husband feels as if she has given up on her family. While on vacation, she imagines that life would have been better if she didn’t have kids so young. But when a man claiming to be Kris Kringle arrives, he shows her how empty life truly would have been without the love of her family.

The world goes backwards on Opposite Day. The kids become adults, and the adults become kids.