Name, date and place of birth, marriage, and death, from Velma Riddell in an email dated 3 February 2021. Velma is the granddaughter of John Lewis Pepperell 1889-1935 and Emily Eva Briscoe 1885-1953.

Date and place of birth and death, date and place of marriage, place of burial all confirmed. Photo of headstone, and photo of Samuel, Matilda with three eldest children Margaret, Sarah and Mary Jane Pepperell, from Find a Grave website found in December 2023:
https://www.findagrave.com/memorial/221716109/matilda-pepperell
Text on page reads:
Daughter of Thomas Robertson, Sapper Royal Engineers. & Matilda Robertson (Crann), born 1862 October 24th, of New Plymouth.
Marriage at the Registrar's Office Inglewood 12th March 1884. Samuel John and Matilda both aged 21. Witness; Elizabeth Ann Crosby. Bride's signature noted by her mark.
Grooms Parents: Samuel Pepperell, Farmer & Mary Pepperell nee Hart.
Brides Parents; Thomas Robertson, Stonemason & Matilda Robertson, nee Crann.
Death:
Died at Kakaramea, 28th January 1944, widow aged 81 yrs., of Senile Decay. Father. Thomas Robertson, Mother. unknown. Burial 31st Jan 1944 Waverley Cemetery. Birth, New Plymouth, Marriage Inglewood to Samuel John Pepperell. Death Certified by Dr W.T Simmons. 28th Jan. 1944.
Headstone Inscription
In Loving Memory Of SAMUEL JOHN PEPPERELL died 13th Jan 1944 aged 82 years.
Also his beloved wife MATILDA PEPPERELL died 27th Jan 1944 aged 82 years.
And their loved son ALFRED JAMES PEPPERELL died 22nd Jan 1915 aged 17 years.
Gravesite Details
Date of Death on Headstone, differs by 1 day, as per Death Cert.
Children listed:
Margaret Robertson Pepperell / Hancock 1882-1971
Sarah Euphemia Pepperell Rye 1884-1950
Mary Jane Pepperell / MacBeth 1886-1964
John Lewis Pepperell 1889-1935
Emmeline Matilda Emily Pepperell / Lister 1891-1943
Edith Harriett Pepperell / Templeton 1893-1979
Florence May Pepperell / Ritchie 1896-1935
Alfred James Pepperell 1898-1915
Leonard Samuel Pepperell 1900-1985
Eileen Pearl Pepperell / Smaller 1904-1986

According to a Facebook post (on the 'Taranaki Families - Genealogy and DNA' Group), by Donna Rutherford on 6 December 2023, Margaret Hancock (nee Robertson) was the illegitimate child of Matilda Robertson, and Donna discovered her father to be a James Lindsay.