Summary from Wikipedia

Angela Isadora Duncan was born in San Francisco, the youngest of the four children of Joseph Charles Duncan (1819–1898), a banker, mining engineer and connoisseur of the arts, and Mary Isadora Gray (1849–1922). Her brothers were Augustin Duncan and Raymond Duncan;[3] her sister, Elizabeth Duncan, was also a dancer.[4][5] Soon after Isadora's birth, her father was investigated and charged following the collapse of the family’s bank, which coincided with a larger reorganization of San Francisco’s finances, a period of crushing reversals and closing of silver mines ...