Lindsay and Sidney Greenbush have said that they landed the role of Carrie Ingalls because when they went in to meet Michael Landon, it was requested that they go in alone while their mother waited outside. This was a real test for these two toddlers, and they passed with flying colors; they had easygoing personalities and didn't even seem fazed about being separated from their mother. Michael Landon knew then that they would be easy babies to film with, and he was right. Throughout the series, it was evident that Lindsay and Sidney were genuinely happy kids, even as 2-year-olds. They were smiling all the time on camera, and they very, very rarely cried. Interestingly, though, the girls' parents once said that they were unhappy during the show's early years, because "they were just kids, and everyone expected them to act like adults," but it got better as the series went on.