- Daughter of Josh Brolin and Alice Adair.
- Granddaughter of James Brolin and Jane Cameron Agee.
- Stepgranddaughter of Barbra Streisand.
- Stepdaughter of Diane Lane.
- HelloGiggles produced a 5-episode podcast series about the making of Manson's Lost Girls (2016) which features discussions with cast members Mackenzie Mauzy, Jeff Ward, Eden Brolin, Christian Madsen, Greer Grammer, Grace Victoria Cox, Garrett Coffey, Isabel Shill, executive producer Nancy Bennett, and director Leslie Libman.
- Younger sister of Trevor Brolin.
- Younger stepsister of Eleanor Lambert.
- Is the lead singer for a band called, Atta Boy, with Lewis Pullman being the drummer. Eden's father is Josh Brolin, who played Lewis' father in the TV show, Outer Range (2022).
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