This material relates almost exclusively to the Peierls's two elder children Gaby (b.1933) and Ronald 'Ronnie' (b.1935) and in particular to their evacuation to Toronto during the Second World War (Bird of Passage, pp. 151-152).

Gaby stayed with Bernice Sanderson's family and Ronnie stayed with Isobel Jephcott's family. The two women were sisters. Mrs Jephcott was an exceptionally affectionate and welcoming person, who became and remained a great friend of the Peierls. Her letters are exuberant and informative but rarely numbered or paginated, and not always dated.