Name, date and place of birth, year of death, photos of headstone, from Find a Grave website found in June 2025:
https://www.findagrave.com/memorial/110113772/alan_ralph-graydon
Name: Alan Ralph Graydon
Birth: 2 Jul 1929
Death: 1996 (aged 66–67), New Zealand
Burial: Waikumete Cemetery & Crematorium, Glen Eden, Auckland Council, Auckland, New Zealand
Plot: NONCONFORMIST DIVISION D Row 10, Plot 22

New Zealand Electoral Roll - Mt. Albert General Roll 1954, found in June 2025:
Graydon, Allan Ralph, 185 Mt. Albert Rd., SW2, printer (R)
Graydon, Gordon Percival, 185 Mt. Albert Rd., SW2, tunneller (R) [Father]
Graydon, Margaret Annie Sinclair, 185 Mt. Albert Rd., SW2, married (R) [Mother]
Graydon, Dean Gordon, 185 Mt. Albert Rd., SW2, linesman (R) [Brother]

Year and country of death, from death search on New Zealand BDM website in July 2025:
1996/38202. Graydon, Alan Ralph. Date of birth: 2 July 1929

Full date of death of 31 August 1996 from further searching in July 2025 on BDM Search by incrementally changing the date range for the death.