
An in‑depth biopic of Princess Margaret from her father’s 1952 death to the 1970s. Though known for a flamboyant image, she kept to royal protocol. The film follows her romances, including the kiss with US ambassador’s daughter, and shows how people and a backbench MP who opposed her 1961 wedding viewed her. By Reece Lloyd.
Does The Queen’s Sister have end credit scenes?
No!
The Queen’s Sister does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of The Queen’s Sister, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Caroline Loncq
Anne Tennant

Toby Stephens
Tony Armstrong Jones - Lord Snowdon

Caroline Harker
Rachel Burke

David Threlfall
Prince Philip

Lucy Cohu
Princess Margaret

Dominic Mafham
Robin Douglas-Home

Ken Drury
Willie Hamilton MP

Jason Thorpe
Ronald Kiddo

Michael Elwyn
Archbishop FIsher

Douglas Reith
Horace Featherstonehaugh

Meredith MacNeill
Sharman Douglas

Edward Tudor-Pole
Cecil Beaton

Benjamin Whitrow
Cronin

Simon Woods
Roddy Llewellyn

Bruno Ouvrard
French Newsagent
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Challenge your knowledge of The Queen’s Sister with this fun and interactive movie quiz. Test yourself on key plot points, iconic characters, hidden details, and memorable moments to see how well you really know the film.
What is the first name of the film’s main female protagonist?
Margaret
Elizabeth
Diana
Camilla
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Read the complete plot summary of The Queen’s Sister, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
Some of what follows is based on fact, and some isn’t.
Margaret Lucy Cohu begins with a look at royal duty clashing with personal longing. When Archbishop Fisher Michael Elwyn blocks a religious wedding to war hero Peter Townsend, and her brother-in-law and confidant Prince Philip David Threlfall warns that a civil union could cost her material security, she makes the painful choice to end the relationship. The decision thrusts her into a public world of headlines and rumors, and she drifts into a hedonistic phase that keeps the press hungry and the palace on edge. The drama paints a portrait of a woman torn between tradition and desire, and the scrutiny that follows every move.
At a glittering party, a new connection catches her eye: Tony Armstrong-Jones Toby Stephens, an ambitious but financially strained photographer. Their initial flirtation gives way to a secret pattern of meetings in his modest flat, where moments of closeness contrast with the cold glare of a society that wants to believe in a fairytale marriage. When their relationship becomes public, they wed in an opulent ceremony that is praised by admirers of the modern monarchy and criticized by politicians and ordinary people who question the sum spent on the celebration while the country faces economic strain. The wedding seems to embody a new, dazzling form of royal spectacle, even as private tensions simmer beneath the surface.
The marriage soon strains under the weight of excess, with Margaret’s growing inclination toward heavy drinking and Tony’s indiscreet womanizing turning the relationship into a push-pull dynamic. He eventually moves out, and a sensational incident involving a pianist from a frequented restaurant forces the couple to confront their reality in the glare of the cameras. They attempt a show of unity by retreating to a private hideaway in Mustique, hoping to weather the storm, but the image of a lavish, isolated lifestyle in the tropics refuels public critique and invites renewed scrutiny.
Seeking respite from the spotlight, Margaret travels to the country home of her friends Rachel Burke Caroline Harker and her partner Curly, where she crosses paths with Roddy Llewellyn Simon Woods, a younger aspiring artist with his own ambitions. The era’s shadow grows heavier with news that Robin Douglas-Home, with whom she once had a highly publicized affair, has died by suicide, a trauma that ripples through the circles around her. Roddy suggests she stay with him at his cottage, hoping for privacy, but a persistent photographer captures an embrace that fuels another round of tabloid condemnation. Amid the upheaval, Tony announces plans to divorce, signaling a permanent fracture in a union once celebrated as a symbol of modern romance.
Margaret’s spiral continues as drinking, drug use, and deepening depression take their toll, culminating in a prolonged hospital stay described as exhaustion. Released from the hospital, she returns to Roddy, who reveals he is planning to marry a housemate, an event that further unsettles her sense of belonging and purpose. With pressures mounting and the public’s appetite for scandal unabated, she leaves for Mustique once more, a solitary figure weathering the storm of fame and longing. The film closes with a poignant image of her standing in the surf, eyes fixed on an uncertain future, the weight of the years behind her and the unknown ahead.
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