A Guide to Hero Fiennes Tiffin’s Famous Family: All About His Uncles, Parents & More

Hero Fiennes Tiffin and Joseph Fiennes at the 'Young Sherlock' premiere
Theo Wargo / Getty Images / Tim P. Whitby / Getty Images for Prime Videos World Premiere of Young Sherlock

What To Know

  • Hero Fiennes Tiffin comes from a prominent artistic family.
  • He’s acted alongside his famous uncles, Ralph and Joseph Fiennes.
  • Hero’s relatives include musicians, filmmakers, conservationists, and archaeologists.

Young Sherlock marks the second time Hero Fiennes Tiffin has acted alongside one of his relatives. The 28-year-old landed his first big screen role in Harry Potter and the Half-Blood Prince, playing the younger version of uncle Ralph Fiennes‘ Voldemort. Now, in Guy Ritchie‘s new series, uncle Joseph Fiennes appears as his onscreen father.

Hero acknowledges the role his last name has played in his career. “I don’t feel any sense of it getting my back up,” he told Tatler just ahead of Young Sherlock‘s debut. “I think it’s so fair. I would never be an actor if it wasn’t for my family being in the industry, and I’m extremely lucky that they were, and nepotism is the appropriate word for why I do what I do.”

Beyond Ralph and Joseph, the actor has a number of other high-profile family members, from his parents to his grandparents. Swooon has the complete guide to them, as well as Hero Fiennes Tiffin’s siblings, below.

Who are Hero Fiennes Tiffin’s parents?

Hero was born to British director Martha Fiennes and cinematographer George Tiffin. Since starting her career directing commercials and music videos — for big names like Boy George — Martha moved into feature films.

Martha Fiennes attends Miu Miu Women's Tales Dinner during Venice Film Festival on September 2, 2018 in Venice, Italy.

Vittorio Zunino Celotto/Getty Images

Her debut film, 1999’s Onegin, starred her older brother, Ralph. Her other brother, Magnus, composed the music, and her sister, Sophie, also acted in it. Martha’s 2005 feature Chromophobia was a joint effort with her husband.

Since then, Martha has been working in “hybrid” film media, per her Cannes film festival bio, using AI-generated digital moving-image artworks. One such work, 2018’s “Yugen,” starred Salma Hayek.

George also works as a director, cameraman, screenwriter, and photographer. Per his website, he started out as a documentary filmmaker before focusing on drama films, commercials, and music videos.

Who are Hero Fiennes Tiffin’s uncles and aunts?

Ralph Fiennes for 'The English Patient' at the 11th Rome Film Festival

Vittorio Zunino Celotto/Getty Images

Ralph Fiennes

Oscar nominee Ralph is the most famous of the Fiennes clan, with films like Schindler’s List and Conclave as well as franchises like James Bond and Harry Potter under his belt.

In his Tatler interview, Hero recalled playing “Fiennes charades” with Ralph and Joseph. “Now I’m older, I’ve realized how lucky we were: front-row seats in the living room to watch incredible actors,” he said. “But again, me and my brother would just be like, “Oh, this is so weird.”’

Joseph Fiennes attends the Young Sherlock World Premiere at Queen Elizabeth Hall on February 24, 2026 in London, England.

Tim P. Whitby/Getty Images

Joseph Fiennes

Fellow actor Joseph, who started his career on stage, is best known for Shakespeare in Love, in which he starred opposite Gwyneth Paltrow. His nephew was eager to prove himself when they filmed Young Sherlock together, per Tatler.

“By the time I had a scene with Joe, I had done weeks and months of work, so I felt confident in playing Sherlock,” Hero said. “But all of a sudden, I was opposite Joe, and I was like, “Oh God, I hope Joe thinks I’m good.”’

Hero continued, “That name brings me to the table, I want to bring some of my own stuff to the table, too… But after working with Joe, I’ve definitely asked [for advice].”

Joseph is married to actress and model María Dolores Dieguez, with whom he shares daughters Eva and Isabel.

Jacob Fiennes

Unlike a fair amount of his siblings, Jacob doesn’t work in entertainment. He’s a wildlife conservationist. Per The Guardian, Jacob said that “[his] mother’s amazing skill was to encourage six very different individuals to express themselves in whatever way they felt suited them.”

Jacob shares two children with wife Melanie Plaice.

Magnus Fiennes attends the Songwriters of North America (SONA) Warrior Awards to support a unified voice protecting expression, compensation, and the rights of Songwriters and Composers worldwide at the Skirball Cultural Center on October 12, 2025 in Los Angeles, California.

Phillip Faraone/Getty Images

Magnus Fiennes

Magnus is involved in both the film and music industry, according to his website. He’s behind the scores of BBC’s Hustle, Murphy’s Law, and Death in Paradise, and as well as feature films like Johnny English. On the producing side of things, Magnus was worked with Shakira, the Spice Girls, and more.

He’s married to Maya Fiennes, a yoga instructor and fellow composer. They share daughters Shanti and Celeste.

Sophie Fiennes attends the 'Grace Jones: Bloodlight And Bami' UK premiere at BFI Southbank on October 25, 2017 in London, England.

Eamonn M. McCormack/Getty Images

Sophie Fiennes

Younger sister Sophie works primarily in documentary film. She made The Pervert’s Guide to Cinema, Grace Jones: Bloodlight, and more.

Michael Emery

Michael is an archaeologist. Per the Sydney Morning Herald, he was adopted by the Fiennes family in 1963. He oversaw the Poulton Research Project in England, according to the BBC, which his brother Ralph helped raise funds for.

Who were Hero Fiennes Tiffin’s grandparents?

The late Mark Fiennes is Hero’s grandfather. He was a photographer known for his architectural studies, and he also illustrated a number of books. He was published in magazines like Country Life. He married writer and painter Jennifer Lash, who published eight books before she died in 1993.

Who are Hero Fiennes Tiffin’s siblings?

The actor has an older brother, Titan Nathaniel Fiennes Tiffin, and a younger sister, Mercy Fiennes Tiffin.