Many fans of Little House on the Prairie will remember that twins Lindsey and Sidney Greenbush share the role of Carrie Ingalls. They turned 50 years old this year and it's crazy to think so much time has passed since they rotated the iconic role together. They were truly destined for this role, though, as they were both born into acting. Their father, usually credited as Billy \u201dGreen\u201d Bush, was an actor as was their mother, Carole Kay Bush. Their father actually appeared in films like Five Easy Pieces (1971) and even appeared in an episode of M*A*S*H. He was also seen in Bonanza, Gunsmoke, and many more western films and TV shows. Lindsay and Sidney Greenbush working as child actors LITTLE HOUSE ON THE PRAIRIE, Lindsay Greenbush, Sidney Greenbush, Season 4, 1974-1983 \/ Everett Collection So, it was a no-brainer that as kids, Lindsay and Sidney would get into the acting biz not just from having actors as parents, but also being able to hang out on-set with their dad. When they were only 7, the family moved to a condo in Malibu to be closer to the set of Little House. RELATED: \u2018Little House On The Prairie\u2019 Theme Song Borrowed Music From This Popular Show It was in 1973 when the girls got their first role together in the TV film Sunshine. Michael Landon was in the midst of casting for Little House when he was in chats with the director of Sunshine, where the director of that film recommended the twins to Landon. Thus, a great partnership with the three of them was born. Immediately after the first casting call, the girls snagged the role. Recalling the opening scene LITTLE HOUSE ON THE PRAIRIE, from left: Melissa Sue Anderson, Michael Landon, Lindsay \/ Sidney Greenbush, Melissa Gilbert (bottom), Karen Grassle, (1975), 1974-83. ph: Carl Furuta\/TV Guide\/\u00a9NBC\/Courtesy Everett Collection May remember the twins (named at birth Rachel Lindsay and Sidney Robyn) in the role of Carrie, especially during the opening theme, where Carrie trips and falls in a meadow. \u201cRobyn actually fell because she had her shoes on the wrong feet. But Michael Landon ended up loving it. It was a natural accident and it became so treasured,\u201d Lindsay tells People Weekly back in 2001. \u201dI remember running down the hill & getting going too fast. I fell & then when I got up I remember my Mom was standing by the camera trying to get me to run again & I thought to myself \u201cNu-uh, no way, we'll just walk\u201d. I wouldn\u2019t do it again & Rachel wouldn\u2019t either, so since both takes had falls in them they decided to leave it that way. Who knows, maybe that was the inspiration for America\u2019s Funniest Home Video,\u201d says Sidney. It took a lot of work to impress Landon LITTLE HOUSE ON THE PRAIRIE, from left: Melissa Sue Anderson, Lindsay \/Sidney Greenbush, Melissa Gilbert, 1974-83. \u00a9NBC\/Courtesy Everett Collection Although the audience loved Carrie and wanted to see more of her, it was Landon himself who wasn't impressed with them. \u201dMichael never made it fun for us. I was always petrified I was going to make a mistake,\u201d Lindsay truthfully noted about working on the show. But, they were able to prove to him eventually that they were meant to be on the show, citing their favorite episode. \u201dMy favorite episode was \u201cThe Godsister\u201d because we finally got a chance to prove to Michael that we were every bit as good & talented as anyone else on the show,\u201d Sidney noted. Their futures did not include acting Lindsay and Sidney Greenbush, on 'Little House' and at 50 \/ Facebook The girls would go on to appear in various commercials and magazines but had a bit of a hard time getting more gigs in Hollywood. \u201dWe auditioned for a lot of the same rolls and it cost us a lot of parts because nobody ever wanted to choose between us and hurt the other one's feelings. We were already used to that and we knew only one could get the roll,\u201d Lindsay says, according to Newsner. They began to focus more on their studies as they grew older and ultimately retired from acting as they attended college. As of today, all we know is that Lindsay lives in California with her husband, Daniel Sanchez. Sidney pursued a career in pro-rodeo and became a member of the Women\u2019s Professional Rodeo Association. She was married to horse breeder and veterinarian William \u201dRocky\u201d Foster for nine years until he tragically took his own life two days after Sidney voiced she wanted a divorce.