In the Will of Charles Frederick NELSON (Probate file - 1918 -- died at Palmerston North), his son "Charles NELSON" is mentioned.
[Had searched earlier for the birth of this son, thinking he may have been born to the second wife, Sarah (Christie).]
The rootsweb archived thread of 2007 (link in previous post), gives a son named as
"Charles Frederick NEILSON". [No NZ birth record cited, but a date of birth - 21 January 1884, and birthplace of "Longbush" (Southland) is stated. ]
This appears to be the birth registration : [Source : NZ BDM online ]
1884 / 10541 - NILSON - Charlie
Parents: Johanne and Charlie
[Asssumed from the above that Johanne LINDHOLD (LINDHOLT) is his mother ? ]
[Date of birth, deduced from online index = 21 January 1884 : NZ Birth Index (at ancestry) has registration place as, Invercargill. ]
[This son married 1905 as Charles Frederick NEILSONand continued to use that version of surname. Died 1964 - buried at Gore Cemetery - headstone has "1881 - 1964" ]