Mark Ruffalo has been a Hollywood star for years thanks to roles such as the Oscar-worthy performance in Spotlight, the challenging decision to take on The Incredible Hulk for decades in Marvel movies, and most recently in HBO's Emmy-nominated series Task.
But Mark's son is coming for that crown, as eldest child Keen is starring in what is set to become Prime Video's next hit YA series, Sterling Point.
Keen stars alongside Ella Rubin, with the pair playing New York City twins forced to navigate family secrets and personal growth when they discover their father's estranged mother has left them a Canadian island in her will.
Here is all you need to know about Keen, and his two younger siblings – all of whom have appeared with their dad on-screen…
Who are Mark Ruffalo's kids?
© AFP via Getty ImagesMark is dad to Keen, 25, Bella, 21, and 18-year-old Odette, whom he welcomed with wife of 26 years, Sunrise Coigney.
The actor is a regular at awards shows, often joined on the red carpet by his wife and kids, all of whom made brief cameos in 2017’s Thor: Ragnarok.
The 58-year-old has spoken openly about his children over the years, revealing that all three children have dyslexia and two have ADHD.
Keen Ruffalo, 25
© Prime VideoOther than appearances in Thor: Ragnarok and another of Mark's films, Begin Again, Keen had previously kept to himself, keeping his Instagram account private for many years.
Now, the account is public, and Keen has over 21,000 followers, with the actor sharing behind-the-scenes moments of his life, as well as promotion for the new series, Sterling Point, in recent weeks. He has also attended Dior fashion shows, and is preparing for the August 14 release of Nimrods.
© Getty ImagesIn 2025, he shared a series of pictures from over the years with his mom, Sunrise, writing: "Happy Mothers Day mom I love you thank you for being my mom."
Mark is also clearly proud of his firstborn, marking his 25th birthday on Instagram in 2026, writing: "Happy Birthday, Keeno. You had a big year. I’m proud of you. Keeping working hard."
© Getty Images for LiveNationStudiIn 2025 Sunrise and Mark both shared pictures of Keen wth his girlfriend, Laura Ferran, and she attended Toronto International Film Festival with the family to support Keen for the premiere of Nimrpds. It is unclear if they are still together.
Bella Ruffalo, 21
© Getty ImagesMark is equally proud of his oldest daughter, penning a sentimental dedication to Bella on her 18th birthday in April 2023. "Happy 18th birthday @belladogood. You live your life like a comet across the sky—burning bright and beautiful. Keep going kid. So proud of you and who you are as you begin your adulthood."
For her 21st, mom Suny shared a picture of Bella, writing: "HBD. This is 21. You made it this far my love, keep on going. I love you madly, I love you deeply, for ever and ever."
© Sunrise CoigneyJulianne Moore and Naomi Watts, two close family friends, were among those to share their birthday wishes as well.
Bella has a public Instagram, with 15,000 Instagram followers, mostly sharing photographs that document Bella's travels, with photos shared from Sicily, Prague, Copenhagen and Berlin, as well as her fashion.
Bella graduated from high school in 2023, and appears sit her time between Berlin, London, and New York City.
Odette Ruffalo, 18
© Sunrise CoigneyBorn on October 12, 2007, Odette was the final piece in the Ruffalo family puzzle.
Odette is still in high school and Mark tends to keep the youngest of their brood away from the public eye – she hasn't been on the red carpet since 2019, and didn't join Mark, Sunrise, Keen and Bella for the unveiling of Mark's star on the Hollywood Walk of Fame.
Back in 2016, Mark used to share lots of photos of his youngest on social media, but she hasn’t appeared on his account in several years, however mom Sunny posted a picture for her 18th birthday, writing: "HBD. This is 18th. You are soooo loved #odettemoonruffalo. And maybe the coolest person I know."
