Looking for John Stuart Mill Who Married Gladys May Langdon IN Australia

Im looking for my Grandfather who was last seen in or around Richmond, Victoria!Australia in the year of approximately 1948, approximate year of birth 1917 to 1921, he was married to Gladys May Langdon and his last known residence was Lennox St Richmond.He had 6 children Gwendolyn, Marilyn,John Leslie, Joannie, Brian and Harry Stuart