The Dictionary of Sydney was archived in 2021.
Macarthur Onslow, Rosa Sibella
Third of eight children, and the only surviving daughter, of Captain Arthur Alexander Walton Onslow and his wife Elizabeth, the daughter of James Macarthur. Known as Sibella, she inherited her mother's considerable estate at Camden Park (963 acres) and 20,000 pounds. She became a prominent charity worker, being on the executive of the New South Wales branch of the Red Cross.