Reasonably certain he was Alvin Arthur Johnson born 24 Jan 1898 per WWI Draft Registration in Williamson County. He named Clara Johnson as the next-of-kin and indicated he was employed by J. A. Johnson-father. He wed Esther R. Nelson and they had Nelson Carl Johnson, 30 May 1928 in Travis County. Nelson Carl wed Betty Olene Olson and they had Rodney Glenn Johnson. Alvin died 7 Sep 1979 and Esther died Aug 1986. Esther was born 18 Jul 1903. You may wish to start a separate posting requesting obit lookup for Alvin and Esther. On 1930 and 1940 census, they sheltered niece, Elouise born ca. 1926.