The sub-series consists of a 1933 letter written by Kay about his new baby brother, Ronald; a 1934 agreement between 9 year-old Kay Trelle and his parents, Herman and Beatrice Trelle, regarding his responsibilities and monthly allowance; his certificate of confirmation at St. Mathew’s Church, Wembley; a few papers relating to his service in World War II; his certificate of Canadian citizenship; his life membership in The Association of Professional Engineers and Geoscientists of the Province of British Columbia; correspondence with two historians (Frank Turek and Ina Bruns) regarding the accomplishments of Herman Trelle, Alberta Agriculture and the Glenbow Museum about the donation of an Alberta Grain Co. Trophy won by Herman Trelle, Lake Saskatoon Agricultural Society about two reunions at Wembley during the 1980s, and Peter Trelle on Trelle family genealogy in Germany; a drawing of Kay and Mae’s proposed home on the shore of Lake Saskatoon; financial records regarding the purchase of four lots in the Lake Saskatoon Cemetery; a 2002 article on Kay and Mae Trelle in the Grande Prairie Regional College newsletter; and a 2005 article about Kay Trelle in the Grande Prairie Herald-Tribune. The sound recording is an interview of Mae Trelle in 2011 about the Trelle family and the life and work of Kay Trelle.