I found John's obituary, but it's quite hard to read. It mentions the daughter Mrs. Hanke who was referenced in the son John's information, as well as a stepchild.
In case you want to follow this line to the end, I found an article from the Idaho State Journal from 22 Feb. 1959 about Cleo V. Hanke, daughter of Mrs. Gladys Johnson, getting married Edmund R. Zentkowski. Cleo & Edmund both show up on the Social Security Death Index with last residence of Ocean Springs, Mississippi. If you do a Google search for Johnson Zentkowski, an obit should come up for Cleo.