Oona Chaplin's mother, Geraldine, is still a very prolific film star, known for her role in Doctor Zhivago, among other many notable roles. Her father, Patricio Castilla, is a Chilean cinematographer who fell in love with Geraldine when they were both working on a film together. While they got together in the 80's, they just got married in 2006 or so. "They just got married about five years ago, but they've been together for a very long time and they're still in love – like, madly in love," she told Biography. "My dad gave up his career for my mom and became her one-man army. He sews her socks and replaces her t-shirts and writes quick emails and turns on the TV for her, runs her bath, puts the champagne in the freezer, all those things. They are so in love, and it's beautiful to me. I have it as an example, and that's what I aspire to in my life."
Chaplin's maternal grandparents are Oona O'Neill Chaplin, fourth wife of Charlie Chaplin. Grandma Oona was a famous socialite (who actually dumped J.D. Salinger for a much older Chaplin) and Charlie, well, everybody knows who Charlie Chaplin is.
"For me, it's always been a massive inspiration…my mother, my grandfather, my great-grandfather – they are just constant, healthy reminders of what one should strive for, of giving your everything to create lasting work, spreading love," Oona told Biography about her famous family.