Here is the actual inscription on the Pyramid, seems that William, Mary and Sarah are there in a post-mortem m?nage ? trois.
http://farm4.static.flickr.com/3274/...6de6eb.jpg?v=0
It Reads:
In the Vault Beneath
lie the remains of
William Mackenzie of Newbie
Dumfrishire, Esquire
Who died 29th October 1851
Aged 57 years
Also, Mary his wife, who died
Who died 19th December 1838
Aged 48 years
and Sarah, his second wife
Who died 9th December 1867
Aged 60 Years
This monument was erected by his
Brother Edward
As a token of love and affection
A.D. 1868
The memory of the just is blessed
Prov. 10. v7
He is listed as 'of Newbie' because shortly before his death he bought a number of big estates around the country - even though he still considered Liverpool as his base of operation.