Name, year and country of birth from search on New Zealand BDM website in July 2025:
1909/11163. Graydon, John Frederick. Mother: Ivy May. Father: George Henry

Full date of birth of 12 April 1909 from further searching in July 2025 on BDM Search by incrementally changing the date range for the birth.

Year and place of marriage from search on NSW Australia BDM website in July 2025:
Registration Number: 324/1934
Groom's Family Name: GRAYDON
Groom's Given Name(s): JOHN F
Bride's Family Name(s): WILCOCK
Bride's Given Name(s): ADA
District: SYDNEY

Full date of marriage of 10 February 1934 from further searching in July 2025 on NSW BDM Search by incrementally changing the date range for the birth.

Year and place of death from search on NSW Australia BDM website in July 2025:
Name: GRAYDON, JOHN FREDERICK
Registration Number: 15147/1983
Father's Given Name(s): GEORGE HENRY
Mother's Given Name(s): IVY MAY
District: 001 [Sydney]

Full date of death of 10 July 1983 from further searching in July 2025 on NSW BDM Search by incrementally changing the date range for the death.

John and Ada are first cousins. Their common grandparents are John GRAYDON (1860-1930) and Elizabeth Jane JONES (1866-1945):
John Frederick GRAYDON > George Henry GRAYDON > John GRAYDON and Elizabeth Jane JONES
Ada Gladys WILCOCK > Elizabeth Mabel Olive GRAYDON > John GRAYDON and Elizabeth Jane JONES