"BLAKISTON, James:
28.9.2000 - 1.10.2019
Cherished son of Rhonda and Joe. Much loved brother and best friend of Nick, Lucy, and Ben and Tinkerbell. Adored by all his extended family and friends...A celebration of Jimmy's life will be held at the Marlborough Convention Centre, 42A Alfred Street, at 1.00pm on Monday, October 7, followed by private cremation at the Sowman Crematorium..."
Published by Marlborough Express on Oct. 3, 2019.
https://deaths.marlexpress.co.nz/nz/obituaries/marlborough-express-nz/name/james-blakiston-obituary?id=40079887Though the Peerage works say he is called "John", his father must be John Blakiston, brother of the 9th Baronet, and husband of Rhonda Hart. The date of birth in the announcement is the known date of birth of this couple's son James William Arthur.