She was born Fanny Weston Bixby in Los Angeles, California, the youngest of nine surviving children of
Jotham Bixby and Margaret Hathaway Bixby. Jotham had arrived in California in 1852 from
Maine, where he and several cousins had formed
Flint, Bixby & Company, which acquired major landholdings, including the 27,000-acre
Rancho Los Cerritos in what is now Long Beach. Fanny grew up wealthy, and although she was an active philanthropist, when she died in 1930 her $2.5 million estate was the largest ever probated in Orange County up to that point. Fanny grew up on Rancho Los Cerritos, of which Jotham was the manager. Later, Fanny's grandfather, the prominent abolitionist and Unitarian minister
George Whitefield Hathaway, came to live with the family. Fanny Bixby wrote about his abolitionist activities, including turning his house into a station on the
Underground Railroad, in her pamphlet entitled
How I Became a Socialist. Fanny Bixby was educated at the
Marlborough School in Los Angeles and the Pomona Preparatory School. She attended
Wellesley College for three years but left without a degree. At Wellesley, she studied sociology with
Emily Greene Balch, who would go on to win the 1946
Nobel Peace Prize. ==Philanthropy and police work==