For Josephine, becoming an actor was always her end goal. "It's been something I've wanted to do for as long as I can remember. I don't think that there was a specific movie or moment that sparked it," she told ContentMode in April 2019. "I think my first performance was probably as Belle in a school play of Beauty and the Beast when I was six." And though she's known she wanted to be an actor since childhood, it wasn't her parents (who are both doctors) who instilled that love of performing in either her or her sister.
"We both got into acting on our own, completely separately, with nothing to do with the other one," she told Refinery29 during an April 2019 interview in reference to her sister, Katherine. "We both grew up in this family, with parents that weren't particularly creative, and were both interested in creative things."