As the Cooper family faces the potential dissolution of their seemingly perfect life, memories of joyful Christmases past begin to resurface. With Sam and Charlotte on the brink of divorce, their adult children, grandchildren, and other close relatives come together for one final gathering before the truth comes to light. Throughout this poignant reunion, flashes of nostalgia showcase the family's younger selves in all their exuberance.
Hank, reeling from his recent divorce from Angie, finds himself grappling with a new setback when he unexpectedly loses his job as a family photographer to automation. Meanwhile, Eleanor, arriving at her parents' home, opts to numb her emotions at an airport bar rather than participating in the family festivities. It is here that she crosses paths with Joe, a stranded soldier. As they share their views on love and commitment, Eleanor confides in Joe about her secret relationship with a married man who evades commitment. Feeling the pressure from her family regarding her romantic life, she persuades Joe to pose as her boyfriend during their family dinner.
In the backdrop, Charlotte's father, Bucky, has turned into a familiar face at the local diner, forging a bond with Ruby, a young waitress wrestling with her insecurities. Their confrontation amplifies when Bucky learns she plans to leave without a word. After apologizing, he extends an invitation for her to join the family dinner. Meanwhile, young Charlie, still in high school, seizes the opportunity to make his feelings known to his crush Lauren at the holiday shop where she works, culminating in a romantic kiss that shifts the dynamics of their relationship.
On a different note, Charlotte's sister Emma lands herself in trouble when she attempts to swipe a piece of jewelry intended as a gift for Charlotte. Officer Percy Williams apprehends her, but after a brief conversation during her ride to the police station, he decides to let her off with just a warning, advising her to pick out the best gift she can afford for her sister.
As these interwoven narratives unfold, the Cooper family Christmas gathering poignantly reminds everyone that love, laughter, and nostalgia endure, even amid strained relationships. Tensions rise when Sam and Charlotte engage in a heated dispute over dinner preparations, and the arrival of four generations of Coopers, along with Joe, Ruby, and Hank's ex-wife Angie, threatens to escalate the chaos. Joe’s careless comment about his relationship with Eleanor sends ripples through the family dynamics, while Hank and Angie confront their bitter divorce, prompting their son, Bo, to plead for peace: > “just stop fighting.”
In the midst of this emotional turmoil, a sudden blackout transforms the atmosphere, leading to unexpected revelations — Eleanor sharing a kiss with Joe, Emma caught sipping someone else's wine, and Ruby in a state of panic as she discovers Bucky's lifeless form.
In the hospital, Hank and Ruby support Bucky as he undergoes tests, while Ruby's affectionate kiss induces a whirlwind of confusion and deep feelings in Hank. Amidst this rising tension, Charlotte faces Eleanor about her affair with Dr. Morrisey, only to suffer the heartache of realizing that Joe was merely a stand-in from the bar. Alone with a resting Bucky in the hospital, Charlotte and Emma engage in a painful argument about their fractured sisterly bond.
As the drama escalates, Joe prepares to leave but is pursued by Eleanor after she locks Dr. Morrisey away, leading to yet another passionate kiss. Meanwhile, Charlie receives an unexpected visit from Lauren in the waiting room, prompted by a text from Bo stemming from his desire to assist Charlie through his own crisis. As Hank provides solace to Ruby, their relationship blossoms amid the chaos, and a reconciliation between Sam and Charlotte occurs just as tensions peak.
In an unexpected twist, Emma takes Officer Percy's counsel to heart, gifting Charlotte an extravagant shower stool from the hospital's gift shop. As Bucky regains consciousness and makes his way to the hospital cafeteria, he witnesses his family unite for a heartwarming "Christmas meal." The strains of uplifting muzak fill the air, sweeping the entire Cooper clan into an impromptu dance around the cafeteria, their spirits buoyed by the magic of the moment. Throughout this whirlwind, Rags, the family's cherished St. Bernard, emerges as the film's narrator, her quiet reflections serving as a heartfelt reminder of love and family’s capacity to surmount even the gravest challenges.
