Parent Trap III

Jeffrey picks up his teenage triplet daughters from the airport. He has become engaged to Cassie McGuire, but he keeps the engagement a secret from the girls, setting a tense summer tone. The hidden engagement foreshadows the romantic entanglements to come.

Cassie reveals she wants to redesign the California beach house with designer Susan Evers. Jeffrey is skeptical at first but starts to warm up to the idea as Cassie pushes forward. The house project becomes a backdrop for later dating misadventures.

Lisa invites Hawk for a dinner at their house and asks Jessie to pretend to be Lisa on a date with David. Meanwhile, Jeffrey plans a double date with Cassie and Susan and Nick as the other couple. The stage is set for a tangled night of mistaken identities.

Jessie ends up on Lisa's date with David and is surprised by the party atmosphere of a faux Welcome Home Lisa gathering. She awkwardly participates in a karaoke bit, performing with the group The Jackson Three and singing What Have You Done for Me Lately. The moment highlights the growing chaos of the ruse.

Hawk asks Lisa to run away with him, but she declines, choosing not to abandon her family or the situation with David. The temptation lingers, signaling further complications to come. The moment adds emotional tension to Lisa's arc.

Jeffrey discovers that Lisa and Jessie have switched identities and are living as each other. He reacts by grounding the girls for three weeks and confronting David about his disappointment in Lisa and Jessie. The family dynamics shift as truth comes to light.

The next morning Susan privately addresses Jessie and Megan, admitting that her compliment was not a random mistake. She shows them a photo of her twin sister Sharon Grand, confirming the impersonation and the plan they have been part of. The sisters begin to grasp the scope of the setup.

Lisa leaves with Hawk on his motorcycle, but their escape ends at a diner where the situation escalates. Jeffrey, Susan, and David converge on the scene, and a confrontation leads to Hawk breaking up with Lisa. The romantic balance tilts toward Jessie in the wake of the event.

After the diner showdown, David begins to warm to Jessie rather than Lisa, reshaping the family’s romantic dynamics. This change reinforces Jessie's growing confidence and positions her differently in the love triangle. The family's affection shifts in subtle ways.

Cassie becomes angry that Susan joined Jeffrey at the diner, deepening tensions around the engagement and the house project. The rift underscores the brewing conflict over the Wyatts' future. This grievance fuels the emotional stakes for the wedding plan.

The girls befriend Susan and arrange a private date for Jeffrey and Susan, deliberately keeping Nick and Cassie from attending. The scheme showcases the girls' growing influence and their desire to see Jeffrey and Susan together. The plot thickens as the wedding looms.

Jeffrey expresses sincere admiration for Susan, but she refuses to pursue a relationship while he remains engaged. The moment acknowledges the tension between desire and commitment, delaying any easy resolution. The couple remains divided by circumstance but drawn to each other.

Susan quits working on the Wyatt beach house and shifts her focus to Nick's condo, signaling a shift in priorities. Cassie then moves the wedding date two days closer, compressing the timeline and intensifying the urgency to resolve the love triangle. The schedule tightens as emotions run high.

The girls visit Susan's apartment and meet Sharon Grand, Susan's twin sister, who agrees to help them set up Jeffrey and Susan. Sharon's involvement adds an extra layer of deception but also potential for a true connection to emerge. The alliance strengthens the plan to bring the couples together.

On the wedding day, Sharon and the girls lock Jeffrey and Susan in the garage shed, causing the ceremony to fail. Cassie hooks up with Nick and leaves, while David and Jessie become a couple. After a piano and music box moment, Jeffrey and Susan realize their love, and Sharon and the girls reveal that the couple is about to kiss.