- Was the one playing Carrie Ingalls in the opening credits of Little House on the Prairie (1974)). She wasn't supposed to fall down while running, and the film crew wanted to re-shoot the scene when she did, but Michael Landon told them to leave it.
- Is the West Coast's top-ranked barrel racer.
- As of 1998, was competing in women's professional rodeo.
- Earned an associate's degree in animal science from Pierce College in Woodland Hills, California, USA.
- Her husband, William "Rocky" Foster, committed suicide on May 5, 2009. It happened two days after Sidney wanted to end their nine-year marriage. He shot himself in the head at their home in Visalia, CA. He was a veterinarian and horse breeder.
- Earned her pro-rodeo permit.
- As of May 2001, was competing in barrel racing, and is training to qualify for the National Finals Rodeo in December 2001. She also trains and consigns horses at her ranch in Littlerock, CA.
- Inducted (as a cast member of Little House on the Prairie (1974)) into the Hall of Great Western Performers of the National Cowboy and Western Heritage Museum in 1998.
- Daughter of Billy Green Bush and Carole Kay Bush.
- Has changed the way she spells her name from Robin to Robyn, to make it look more feminine.
- Graduated from Santa Monica (CA) High School in 1988.
- Twin sister of Rachel Lindsay Greenbush, younger sister of Clay Greenbush.
- Aunt of Katlynn Danae Bush.
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