No children.
Name and date of birth from Muriel Leo’s (nee Oliver, 1917-1998) Family Tree.

Dax Eric Clayton Lloyd, great-grandson of Jessie Bertha Oliver b.1876 claims year of birth is 1933 and not 1934.

Dax later writes:
“Norman James Oliver has passed away. Here is is burial record
Surname: OLIVER
First name: NORMAN JAMES
Age at death: 78
Date of death/burial: 10/7/2012
Cemetery: Cremation
Address: 145 MAIN ROAD
District: CLIVE
Occupation: CLERK
Block name:
Plot number: 0
Site:
Purchaser:
Funeral director: TERRY LONGLEY AND SON
Reference: 29532”

New Zealand Electoral Roll - Hastings Main Roll 1963, found in July 2018:
Oliver, Norman James, 700 Terrace Rd., clerk
Oliver, Ivor James C., 700 Terrace Rd. driver
Oliver, Loma Elizabeth, 700 Terrace Rd., married

New Zealand Electoral Roll - Hastings Main Roll 1969, found in July 2018:
Oliver, Norman James, 700 Terrace Rd., clerk
Oliver, Ivor James Clark, 700 Terrace Rd. gardener
Oliver, Loma Elizabeth, 700 Terrace Rd. married

Country of birth from search on New Zealand BDM website in July 2023:
1934/14611. Oliver, Norman James. Mother: Loma Elizabeth. Father: Ivor James Clark

Full date of birth of 22 February 1934 confirmed from further searching in July 2023 on BDM Search by incrementally changing the date range for the birth.