I've just checked out Anderson Bay Cemetery site and they have some very helpful records indeed. Their records cover a number of cemeteries in the area.
I found Henry C Cameron's data. He died on the 19th July 1936 age 44. Occupation labourer. No one buried with him in the plot.
I've also found my great grandmothers death recorded at Anderson Bay Cemetery on 16th July 1937.
In the notes section it says widow, native of England and years in New Zealand 10. It would seem that she emigrated to New Zealand in / around 1927. This was about the same time a Minnie Todd emigrated to NZ on the Corinthic: December 1926.
It also indicates that she was buried with two others: Alexander William Carnahan (1 day old) died 24th August 1915 and Eva Mary Carnahan, the baby's mother I presume (aged 26), died 21st December 1919. There is also a map of the place of the burials - block 30 / plot 39. No headstone for them or Henry

Checked out burials / cremations for Sarah, Charlotte, Donald and Henry Cameron's parents, John and Mary, to no avail.
Sarah Todd (Cooper / Cameron) doesn't seem to have had much luck! Widowed aged 23, again aged 41 and lost her mother the following year.
I wonder why my great grandmother was buried with Eva Carnahan and her baby? I wonder who these people were in fact: the Carnahans? She was married and must have left a husband (and children?) behind. Her address is recorded as being at 16 Nelson Street South Dunedin.
I went on to check out all persons named Carnahan buried in that area - no link.
I'm going to search for Margaret, Mary and Robert Todd (Minnie's siblings) to see if they emigrated too.
Patty