When Mathilda Johannisson was born on 28 November 1851, in Ryssby, Kronoberg, Sweden, her father, Sven Johan Johannisson, was 39 and her mother, Catrina Svensson Or Svensdotter, was 38. She married William Henry Perkes on 21 February 1876, in Salt Lake City, Salt Lake, Utah, United States. They were the parents of at least 4 sons and 2 daughters. She lived in Salt Lake City Ward 3, Salt Lake City, Salt Lake, Utah, United States for about 10 years. She died on 16 April 1917, in Salt Lake City, Salt Lake, Utah, United States, at the age of 65, and was buried in Salt Lake City Cemetery, Salt Lake City, Salt Lake, Utah, United States.