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Delmer was born 12 November 1910 in Caldwell, Idaho to Delmer Samuel Johnston (1886-1978) and Clara Frost and died 27 May 2003 Emmett, Idaho of unspecified causes. He married Noma Grace Williams (1913-2002) .
Children
| Name | Birth | Death | Joined with |
| Orval Gene Johnston (1934-) | 11 July 1934 Boise, Idaho | Joan Louise Radandt (1937) | |
| Edward Dee Johnston | |||
| Clara Lee Johnston | |||