Hollywood is packed with famous family dynasties. From Jake and Maggie Gyllenhaal to Casey and Ben Affleck, talent frequently runs in the family. But while sharing the spotlight is one thing, competing for the exact same role is another. Behind the scenes of some of your favourite movies, showbiz siblings have gone head-to-head in the audition room. Keep reading to discover which famous brothers and sisters have auditioned for the same parts. © Getty Images Chris and Liam both auditioned for Thor Chris and Liam Hemsworth Chris Hemsworth is globally recognised for his iconic portrayal of the superhero Thor in the Marvel Cinematic Universe. But the MCU could have looked very different, as his younger brother, Liam, was also considered for the part.  When asked whether Liam had auditioned for the role during an interview with Vanity Fair, Chris confirmed that the rumours were true. “Yes he did,” revealed the Australian actor. However, he wasn’t worried that his brother would land the part.  “I was told I didn’t have the part at that point. So …