Looking at this website:
https://www.genealogysa.org.au/index.php?option=com_gsa&view=gsa&layout=essearch&collection_id=marriage&page_no=1&sort_by=&sort_direction=asc&Surname=stevenson&GivenName=Malcolm%2C&year_from=&accuracy=Malcolm Stevenson married in 1920 in Burra district to Caroline Mary Sandland (other information only available to members).
Three children are registered in Adelaide district to Malcolm Stevenson, including Malcom John in 1922.
One tree online says Malcolm senior was also born in South Australia in 1891 and Caroline Mary Sandland in South Australia in 1894.
Registration of birth of a Malcolm Stevenson in Adelaide district in 1891 son of Walter Hunter Stevenson.
Registration of birth of a Caroline Mary Sandland in Burra district in 1894 daughter of John Chesters Sandland.
Registration of marriage of a Walter Hunter Stevenson in Adelaide district in 1878 to a Harriet Elizabeth (surname not on index).
Registraiton of death of a Walter Hunter Stevenson in Adelaide district in 1930 and 1949. There was a birth for a Walter Hunter Stevenson junior too.
Registration of marriage of a John Chesters Sandland in Burra district in 1883 to a Caroline McBride.
Registration of death of a John Chesters Sandland in Burra district in 1909.
From FreeBMD, a John Chesters Sandland birth registered in Sep quarter 1845 in Wem registration district. Mother's maiden name: Cooper.
Other birth registered with John Chesters Sandland as father:
John Leslie Sandland 1886 in Burra district
Bertram Cameron 1891 in Burra district
Robert Chesters 1888 in Burra district
Myrtle McBride 1896 in Burra district
Morton Reginald 1889 in Burra district
Kathleen Bessie 1884 in Burra district
Nellie Gertrude in 1899 in Burra district