Cyril James Cusack was born in Durban, Natal, South Africa, to Alice Violet (Cole), a Cockney English actress and chorus girl, and James Walter Cusack, an Irish mounted policeman in Natal. He was brought up in Ireland. He was a child star on the Irish stage, appearing first at the age of 7. He toured Ireland with his own theater company. Although he made some very telling film appearances, his small stature kept him from the classic roles.
With his wife, Irish-born actress Maureen Cusack (née Mary Margaret Kiely), he is the father of actress Sinéad Cusack and the grandfather of actor Max Irons.
