The sous-fonds consist of correspondence from Daniells' family after his death from friends. While many of these are laudatory or conventional, others contain interesting recollections. For this reason, they have been placed with the collection even though they are not, technically speaking, part of the Roy Daniells papers.

Carol Coates was born in 1906 in Japan, where her parents were missionaries. She received her early education in Japan and later attended the University of British Columbia. Her future husband, Eugene Cassidy, and Roy Daniells became close friends, sharing a love of literature. The Cassidys were married in 1930 and returned to Japan, where they remained for some years. The correspondence with Daniells is romantic, savouring of spiritual and poetic inspiration and unrequited love (she called him "Dante" and signed herself "Beatrice"). After returning from Japan, Coates taught in Toronto and was connected with Steiner education in New York, England and Edinburgh. She published two books of poetry, Fancy Free and Invitation to Mood.
Eugene Cassidy was also born in Japan to missionary parents, was educated in Japan, and attended British Columbia University. He returned to Japan in 1930, where he taught school and became intensely interested in photography. He and his family came to Canada in 1938, and Cassidy began work as a photographer in Toronto. He and Coates later separated, and Cassidy went to New York to become a successful contract photographer for Conde Nash. His photography, particularly his Japanese landscape work, has received considerable recognition, and in 1981 there was a retrospective of his work at the Art Gallery of Ontario. However, because of his frequent moves, many of his Japanese photographs have disappeared, and it is probable that some of the small prints in this collection are unique.
The sous-fonds consist of letters, hand-made poetry books, photographs, a photograph album, and an album of Japanese "shugibukuso," envelopes the Japanese use to present money. The correspondence dates from 1930 to 1953, the majority of the letters being written in the 1930s from Japan.
The materials in this group of papers were segregated from the main series primarily because they were fragile and easy to use. The correspondence was initially been in chronological order by year with other correspondence. The photographs and small poetry booklets, however, had been kept separately. A large portion of the correspondence between Daniells and Coates was returned to Carol Coates in 1942 and subsequently destroyed.

James MacFarlane Daniells was born in England in 1867. He came to Canada before the turn of the century but returned to England after a short time. In 1910, after some business reverses, he emigrated with his family to Victoria, B.C. where he worked as a builder, first in James Bay, then on Cook Street, and eventually he built a home on Cochrane Street where he lived until his death in 1951. Mr. Daniells was an overseer in the Gospel Hall and was a devout student of the Bible. Constance Maynard Daniells, nee Stevens, was born in England in 1876. In 1901 she married James Daniells, and they had one son, James Roy Daniells, who was born in 1902. She died in 1957. Constance and James joined the Plymouth Brethren in Victoria. The Plymouth Brethren were a sect of Christian believers originating in the early 19th century in Ireland. Brethren ideas of baptism were differing (RD was baptised by immersion) and they expected the second coming of Christ. The Lord's Supper was observed each Sunday. The Brethren had a tendency to follow new leaders and to divide to form new congregations. They were basically fundamentalist and considered the Scriptures the only true guide. There were no officers in the Victoria Hall. James Daniells was one of the "overseers" for a time. The privileges and duties of the ministry depended on the ability of the members.
The sous-fonds consists of correspondence (including many letters from Roy Daniells), journals, legal documents, financial papers, maps, greeting cards, newspaper clippings, verses and family information of James and Constance Daniells. There is also a series of records relating to the Plymouth Brethren, both in London and in Victoria, B.C. including incorporation documents, tracts, sermons, notes, hymn books, bibles, booklets etc. Photographs and postcards have been kept with the Roy Daniells collections.