Born 1920s, date of death, year and place of two marriages, two daughters and one son, Brian, from second marriage to Betty, sadly drowned in a boating accident when only aged 33, found in July 2023 from:
https://www.wikitree.com/wiki/O'Connor-2307

Year and country of birth from search on New Zealand BDM website in July 2023:
1923/12388. O'Connor, Thomas Brian. Mother: Isabella. Father: John Frederick

Full date of birth of 1 June 1923 from further searching in July 2023 on BDM Search by incrementally changing the date range for the birth.