Name, year of birth, country of birth from search results of official BDM Historical Records generated by Brian of nzolivers.com showing children born in New Zealand to Louisa and Samuel:
1875/9161 Gates, Ernest Louis
1876/11311 Gates, Frank
1878/14616 Gates, William James
1880/5341 Gates, George
1881/11799 Gates, Ada
1884/6932 Gates, Gertrude Jane

Full date of birth of 2 May 1875, place of birth of Christchurch from research file10
in June 2017.
Married Sarah Selina (Lennie) Burch b. 18 Dec 1884 Nelson NZ, d. 10 August 1953 aged 68 (Surname, preferred name, from research file10).

Date of death of 10 June 1953, aged 78, from billiongraves.com website for Greytown Cemetery.

Married in 1907 as per BDM Historical Records.

Had a son called Norman Cyril Gates from research file10 - b. 24 January 1908 in Greytown, d. 20 July 1983 in Levin. No known marriage or children).

Had a son called Victor Howard Gates from research file04.

Brian of nzolivers.com generated the following search results of official BDM Historical Records showing children born in New Zealand to Ernest Lewes Gates and Sarah Selina Gates (nee Burch):
1908/23578 Gates, Norman Cyril
1909/24956 Gates, Clarence
1911/2607 Gates, Reginald Ernest
1914/18738 Gates, Alberta Lilian
1916/8941 Gates, Kenneth Herbert

Brian has found this news item on Papers Past website:
WAIRARAPA STANDARD, VOLUME XVIII, ISSUE 1753, 30 OCTOBER 1885
Carterton School Examination.
The following scholars passed at the annual examination just held by Inspector Lee : -
Standard I—Alfred Appliu, Leonard Applin, Adam Armstrong, Arthur Bennett, William Booth, Robert Buckeridge, Walter Campbell, Herbert Carter, Francis Conway, William Darby, Ernest Gates, George Greathead….

Brian has found this news item on Papers Past website:
WAIRARAPA STANDARD, VOLUME XIX, ISSUE 1895, 29 OCTOBER 1886
Annual School Examinations.
CARTERTON SCHOOL.
This school examination was concluded on Wednesday and the results appear to be very satisfactory. The following are the passes in the several standards :
Standard ll.—Adam Armstrong, Arthur Bennett, …William Forbes, Ernest Gates, George Greathead…

From the Greytown section of the 1913 Wise’s New Zealand Post Office Directory, City & Area Directories, 1866-1954:
Gates, Ernest, labourer

From the 1916 Wise’s New Zealand Post Office Directory, Greytown section:
Gates, Ern. [Ernest], labourer

From the 1923 Wise’s New Zealand Post Office Directory, Greytown section:
Gates, Ern. [Ernest], labourer

From the 1933, 1936, and 1938 Wise’s New Zealand Post Office Directories, Greytown section:
Gates, Ern. L [Earnest], farmer

Ernest Lewis Gates appears in the New Zealand, World War II Ballot Lists, 1940-1945, 1940 October, ex Ancestry.com:
“266867 Gates, William Francis, Farm Hand, care of E. L. Gates, Greytown”.

From the 1946 Wairarapa Electoral Roll:
Gates, Ernest Lewes, Main Street, Greytown, farmer
Gates, Sarah Selina, Main Street, Greytown, married

From the 1949 Wairarapa Electoral Roll:
Gates, Ernest Lewes, Main Street, Greytown, farmer
Gates, Sarah Selina, Main Street, Greytown, married

Brian of nzolivers.com notes three different spellings for Ernest’s middle name:
Lewes
Louis
Lewis
The second name of ‘Lewes’, is confirmed by the full legal Birth Certificate of Ernest’s son, William Francis Gates. Also, place of birth of Christchurch is confirmed by this Birth Certificate.

Occupation of Dairy farmer from Ernest’s son’s (Willian Francis Gates) official full New Zealand Death Certificate.

Brian also notes that Ernest’s father was born in ‘Lewes, Sussex, England’, sailing out to New Zealand when aged 35. Did this influence the spelling of his name?

Ernest Lewes Gates here, married ‘Sarah Selina Burch’ b.1884.
Brian of nzolivers.com notes that Ernest’s younger sister, ‘Gertrude Jane Gates’ b.1884, also married into the Burch family by marrying ‘Adolphus Dodson Burch’ b.1876, Adolphus being the older brother of Sarah Selina Burch!

Record from marriage search on New Zealand BDM website in May 2021:
1907/4116. Bride: Sarah Selina Burch. Groom: Ernest Lewis Gates

Full date of marriage of 10 April 1907 from further searching in May 2021 on BDM Search by incrementally changing the date range for the marriage.