In 1960, Eli and Penny welcome Eli’s grumpy father, Walter, into their home, and must carefully manage family dynamics during the holiday season while helping their son Alex with a Christmas-themed time capsule for a school assignment. Fast forward to 1998, where Regina and Nelson meet for the first time when a snowstorm leaves Nelson stranded at Regina’s house on Christmas Eve. Jumping to 2015, Jessie encounters a significant hurdle while organizing her sister’s impromptu Christmas Eve wedding — the officiant is Tim, her high school love, whom she hasn’t encountered in nearly two decades.