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;[2] her sister, Elizabeth Duncan, was also a dancer.[3][4] Soon after Isadora's birth, her father was found to have been using funds from two banks he had helped set up to finance his private stock speculations. Although he avoided prison time, Isadora's mother (angered over his infidelities as well as the ...