O'Sullivan was born in Boyle, County Roscommon, Ireland, in 1911, the daughter of Mary (née Frazer) and Charles Joseph O'Sullivan, an officer in the Connaught Rangers who served in World War I. She was of Irish, English and Scottish ancestry. She attended a convent school in Dublin, then the Convent of the Sacred Heart at Roehampton (now Woldingham School), England. One of her classmates there was Vivian Mary Hartley, future Academy Award-winning actress Vivien Leigh. After attending finishing school in France, O'Sullivan returned to Dublin to work with the poor.
shes mia farrows mum.
|Spouse(s)||John Farrow (m. 1936–1963; his death; 7 children)|
James Cushing (m. 1983–1998; her death)