At the age of 40, two years after moving out on her own, Travers adopted a baby boy from Ireland who she named Camillus Travers. He was the grandchild of Joseph Hone, W. B. Yeats' first biographer, who was raising his seven grandchildren with his wife. Camillus was unaware of his true parentage or the existence of any siblings until the age of 17, when Anthony Hone, his twin brother, came to London and knocked on the door of Travers's house at 50 Smith Street, Chelsea. He had been drinking and demanded to see his brother. Travers refused and threatened to call the police. Anthony left but, soon after, following an argument with Travers, Camillus went looking for his brother and found him in a pub on King's Road. Anthony had been fostered and raised by the family of the essayist Hubert Butler in Ireland.