Jake Gyllenhaal And His Sister, Maggie, Played Siblings Donnie And Elizabeth Darko In Donnie Darko (2001)
This movie helped greatly to move Jake Gyllenhaal's acting career and for Maggie, it was only her second significant role. When the director, Richard Kelly, offered Maggie the role of Elizabeth, she didn't agree at first, because Maggie was convinced that she was considered only because she was Jake's sister.