Catherine Rubina Milne was born on 27 June 1909 in Elma Township, Perth County, Ontario.
In 1924, Catherine moved to Texas, USA with her parents, Charles Alexander Milne and Elizabeth Pollock. The family was accompanied by Charles and Elizabeth’s niece, Dorothy Milne, who had been informally adopted by them.
Catherine married Louis Willis Barnett in 1927. The couple had three sons. Louis and two of their sons predeceased Catherine.
Catherine died on 4 May 1981 in San Antonio, Bexar County, Texas. She is buried at Bundick Cemetery, Smiley, Texas.