Rosalie Maria Delacour was born in Brussels on the 7th of november 1988. She's the daughter of Philip Delacour, owner of the famous Royal Windsor Hotel in Brussels and Jane Greville, oldest daughter of the earl of Warwick. They got divorced in 1997 when Rose was nine years old. She has one older brother named John "Johnny" (*1986, Brussels) as well as a younger sister named Amelia (*1990, Brussels). After her parents divorce she and her siblings stayed with their father while her mother moved back to england.