Name, date and place of marriage, date of death, place of burial, photo of plaque, from Find a Grave website found in May 2025:
https://www.findagrave.com/memorial/228795613/william_john_george-bartlett
Name: William John George Bartlett
Birth: 1881, Ōnehunga, Auckland Council, Auckland, New Zealand
Death: 4 Oct 1956 (aged 74–75), Hastings, Hawke's Bay, New Zealand
Burial: Hastings Cemetery and Crematorium
Camberley, Hastings District, Hawke's Bay, New Zealand
Plot: RSA B52
Inscription:
67646 PTE.
W.J.G. Bartlett
Auckland Regt.
Died 4.10.1956
Aged 74 yrs

Marriage: William John George Bartlett married Mary Hodge Caldow in Onehunga on 16th March 1901

Children:
1902 - 1931 Myra George Bartlett - married Thomas Henry Berry in Napier in 1923
1907 - David Bartlett
1909 - William George Bartlett
1913 - Adele Bartlett
1916 - George Caldow Bartlett

Year and country of birth from search on New Zealand BDM website in May 2025:
1881/1034. Bartlett, William George. Mother: Margaret Jane. Father: George Henry

Full date of birth of 8 February 1881 from further searching in May 2025 on BDM Search by incrementally changing the date range for the birth.