The climate activist took to Instagram, revealing that Olof Thunberg had “passed away”. She posted: “Yesterday my grandfather Olof Thunberg passed away. He was about to turn 95. He was one of the kindest people I have ever known. We miss him terribly.”
The 17-year-old from Sweden also took to Twitter to post a series of heartfelt photos of her grandfather.
She said that her grandfather was “one of Sweden’s biggest actors”.
Beginning his career just after the war, Olof Thunberg worked as a director, actor and voice artist over a 75-year-long-career.
Olof acted in films and TV shows and later progressed to direct TV movies.
His most notable role involved his voice acting on the Swedish version of Disney’s The Jungle Book. Olaf played the role of the tiger Shere Khan in the film.
When her grandfather died, Greta was in Oxford meeting one of her ‘role models’ Malala Yousafzai at Lady Margaret Hall.
Posting on Twitter, Malala said: “She’s the only friend I’d skip school for.”
READ MORE: Greta Thunberg heartbreak: Artist forced to SCRAP tribute to activism
Greta became famous after skipping school every Friday to protest against climate change.
The 17-year-old is currently on a gap year where she is attending climate strikes across the world.
She is now in the UK and will be joining the school strike for climate on Friday in Bristol.
Taking to Twitter, Greta said: “Heading for the UK! This Friday, the 28th, I’m looking forward to joining the school strike in Bristol!”