First two given names from birth search of son on New Zealand BDM website in July 2025:
1900/8646. Barclay, Robert Baden. Mother: Mary Ellen. Father: John

Maiden name, year and country of marriage, from search on New Zealand BDM website in July 2025:
1899/5501. Bride: Mary Ellen Powell. Groom: John Barclay

Full date of marriage of 12 April 1899 from further searching in July 2025 on BDM Search by incrementally changing the date range for the marriage.

Year of birth, date of death, place of burial, from Find a Grave website found in July 2025:
https://www.findagrave.com/memorial/221243272/mary_ellen-barclay
Name: Mary Ellen Barclay (nee Powell)
Birth: 1879
Death: 10 Nov 1932 (aged 52–53)
Burial: Purewa Cemetery and Crematorium, Meadowbank, Auckland Council, Auckland, New Zealand
Plot: Block D Row 30 Plot 1A

Country of birth from search on New Zealand BDM website in July 2025:
1879/5918. Powell, Mary Ellen. Mother: Emily. Father: John

Full date of birth of 18 August 1879 from further searching in July 2025 on BDM Search by incrementally changing the date range for the birth.

Country of death, from death search on New Zealand BDM website in July 2025:
1932/8667. Barclay, Mary Ellen. Died age 53Y

Full date of death of 10 November 1932 confirmed from further searching in July 2025 on BDM Search by incrementally changing the date range for the death.