The Kensington sisters thought they’d seen it all—until their twice-widowed mother, Diana, announces her third wedding. Katherine (Scarlett Johansson), the high-strung eldest; Victoria (Sienna Miller), the perpetually single free spirit; and Georgina (Emily Beecham), the peacemaking middle child, descend on their chaotic family estate for what should be a weekend of polite toasts and stiff smiles. But Diana (Kristin Scott Thomas) isn’t marrying just anyone—she’s chosen a man who ignites old tensions and unearths buried grief, forcing her daughters to grapple with their own stalled lives and fractured bonds.

As a riotous brigade of “unexpected guests” descends—including Diana’s outrageously blunt nurse (Gary Lamont), the groom’s suspiciously militant best man (Samson Kayo), and a pair of opinionated pre-teens (Lydia & Josephine Jones)—the wedding spirals into a darkly comedic showdown. Past betrayals, secret insecurities, and the ghosts of lost fathers collide amidst floral arrangements and open bars, turning a celebration of new beginnings into a hilarious, heart-wrenching reckoning. Don’t miss the ultimate family meltdown in theaters August 8!

My Mother’s Wedding all actors list

1: Scarlett Johansson as Katherine

Oscar winner Scarlett Johansson masterfully portrays Katherine, the hyper-competent eldest sister buckling under the weight of unresolved grief and maternal expectations. Johansson layers Katherine’s polished exterior with brittle anxiety and simmering resentment, revealing a woman who’s spent years “managing” her family’s chaos to avoid confronting her own pain. Her performance is a tightrope walk of control and vulnerability.

As the de facto family CEO, Katherine’s meticulous plans implode spectacularly. Johansson delivers razor-sharp wit and raw emotional collapse as she clashes with Diana’s life choices and her sisters’ messy lives, forcing Katherine to question whether perfection is a shield—or a prison.

2: Sienna Miller as Victoria

Sienna Miller dazzles as Victoria, the bohemian youngest sister whose freewheeling charm masks deep-rooted commitment phobia. Miller infuses Victoria with infectious energy and wry self-awareness, painting her as the family’s lovable disruptor who uses humor and flirtation to dodge real intimacy. Her chemistry with Johansson crackles with sibling rivalry and unspoken affection.

Miller shines as Victoria’s defenses crumble amid wedding chaos. Her journey—sparring with Diana’s stoic nurse (Gary Lamont), confronting ex-lovers in the buffet line, and accidentally bonding with the groom’s cynical nephew (Fflyn Edwards)—reveals the loneliness beneath her glittering facade.

3: Kristin Scott Thomas as Diana

Dame Kristin Scott Thomas commands the screen as Diana, the enigmatic matriarch whose third marriage sparks the family crisis. Scott Thomas balances Diana’s steely elegance with flashes of aching vulnerability, hinting at the resilience forged through loss and the quiet desperation for happiness. Her performance is a masterclass in repressed emotion.

Diana’s refusal to explain her choices becomes the film’s emotional grenade. Scott Thomas crafts a woman torn between maternal guilt and fierce self-determination, delivering devastating one-liners and silent glances that speak volumes about the sacrifices buried in her past.

4: Emily Beecham as Georgina

Emily Beecham (“Little Joe,” The Pursuit of Love) delivers nuanced warmth as Georgina, the overlooked middle sister playing full-time mediator. Beecham embodies Georgina’s quiet exhaustion and buried resentment, painting her as the family’s emotional pack mule. Her subtle expressions scream volumes as she navigates between Katherine’s judgment and Victoria’s chaos.

Georgina’s breaking point arrives via her rebellious kids (Lydia & Josephine Jones) and Diana’s shocking revelations. Beecham’s transformation—from placating peacekeeper to fiercely advocating for her own needs—anchors the film’s most cathartic moments.

5: Gary Lamont as Nurse

Gary Lamont (“Still Game”) steals scenes as Diana’s hilariously unflinching live-in Nurse. Lamont’s deadpan delivery and physical comedy turn the nurse into a truth-tossing wildcard, offering unsolicited medical opinions and withering takes on the family’s drama while handing out blood-pressure meds.

His no-nonsense presence becomes an unexpected catalyst, cutting through Kensington pretension with Scottish pragmatism. Lamont’s scenes with Scott Thomas are gold—a battle of wits between stoic professionalism and aristocratic stubbornness.

6: Samson Kayo as Steve

Samson Kayo (“Our Flag Means Death”) brings chaotic charm as Steve, the groom’s cynical, security-obsessed best man. Kayo’s impeccable timing makes Steve a scene-stealer—whether he’s interrogating guests with paranoid zeal or bonding with the sisters over existential dread. His outsider perspective highlights the family’s absurdity.

Steve’s unlikely friendship with Victoria (Miller) becomes a comedic lifeline. Kayo layers the character with unexpected depth, revealing a man hiding his own heartache behind conspiracy theories and tactical vests.

7: Lydia Jones & Josephine Jones as Clara & Daisy

Real-life sisters Lydia and Josephine Jones light up the screen as Clara and Daisy, Georgina’s precocious pre-teen daughters. Their natural sibling dynamic adds authentic mischief, whether they’re eavesdropping on adult drama or staging protests against “boring wedding traditions.”

The duo’s unfiltered observations cut to the heart of family secrets. Their journey—from mischievous flower girls to accidental therapists—provides both levity and poignant insight into generational cycles of love and loss.

8: Fflyn Edwards as Marcus

Fflyn Edwards (“The Fence”) portrays Marcus, Diana’s quietly observant teenage grandson. Edwards conveys Marcus’s silent rebellion and wry intelligence through subtle glances and sarcastic asides, positioning him as the wedding’s reluctant chronicler and emotional barometer.

His bond with Diana (Scott Thomas) becomes unexpectedly tender. Edwards shines as Marcus navigates the adult chaos, offering Diana rare moments of unfiltered honesty and challenging her with quiet questions about grief and moving on.