A Merry Little Ex-Mas

Everett brings Tess to Christmas dinner because he wants to introduce his new girlfriend to the family during what they agreed would be their final Christmas together. He's been dating Tess for a while but struggled to find the right moment to tell Kate, especially since the divorce was already emotionally complicated. The timing becomes awkward when Nigel accidentally reveals the relationship before Everett can explain it himself.

Kate reveals she's selling the house and planning to move to Boston during the gingerbread contest as a reaction to Everett's comment about carrying lessons from their marriage into future relationships and children. The suggestion that he'd apply what he learned with Kate to a new family triggers her frustration, and she announces her plans to sell the home she's cherished, signaling she's ready to fully move on from their shared life.

Earlier, Kate mentions testing new traditions and meeting Chet, hinting she's already considering changes to her life.

The fire on Christmas Eve appears to be an accident, likely caused by the indoor grill that Kate gave Everett as a gift. During the chaos, Chet strips down and attempts to put out the flames with his clothes while Gabriel finds a fire extinguisher to control the blaze. The fire serves as a turning point that forces the family to work together and ultimately brings them closer.

Everett declares he doesn't want a divorce after experiencing the chaos of Christmas Eve, the fire, Tess leaving, and watching Kate care for the family. He realizes his workaholic priorities have cost him his marriage and offers to quit being a doctor to stay with Kate. His confession comes on the balcony late at night, where he finally chooses family over his career.

Everett's apology during the gingerbread contest about spending too much time at work planted the seeds for this change.

Kate rejects Chet after the fire because she realizes her connection to Everett and her family is what truly matters. While Chet represents a fresh start and a different path from her life with Everett, the fire and subsequent chaos make her recognize that she wants to stay and fight for her family rather than run away with someone new. She thanks him for his kindness but chooses to remain in Winterlight with her children.

Kate's curiosity about Chet was sparked earlier when she met him at the tree lot, but her interactions with Everett during the sledding injury showed their underlying connection.

Everett explains during the gingerbread contest that being the son of gay dads made him feel he had something to prove. He wanted to demonstrate that he could succeed and provide for a family, which drove him to become a workaholic and prioritize his medical career over his marriage. This backstory explains his emotional unavailability and why he struggled to be present for Kate and the children.

The film establishes early on that Everett's demanding clinical schedule clashed with Kate's environmental commitments.

Tess leaves during the fire because she sees the chaos and Chet's dramatic stunt as a red flag. Having watched Everett's connection with Kate throughout the weekend, Tess realizes Everett's heart isn't fully in their relationship. She views the disorganized scene as a sign that this family dynamic is too complicated and decides to leave, with Chet eventually picking her up.

Tess was visibly unsettled by the contrast between Kate and Everett's gift exchange, sensing their unspoken history.

Kate decides to stay in Winterlight because the Christmas Eve events, particularly the fire, the power outage, and Everett's confession, reaffirm that her family is what matters most. After rejecting Chet and seeing Everett choose her over his career, she admits she doesn't want to move to Boston. The solar-powered house becomes a symbol of her commitment to staying and keeping the family together.

Kate's earlier tree-shopping trip and meeting Chet represented her temptation to change, but the family's unity during the crisis draws her back.