OK! The Manx Museum Library was open today (closed Sunday, Monday & Tuesday), so I managed to get something.
Kirk Rushen has 4 graveyards: the Old Yard, 1869 Yard, 1899 Yard and 1926 Yard.
Your people are buried in the 1869 Yard (West of the Vicarage Wall), grave reference E2.
The Monumental Inscription says:
In Affectionate Rembrance
of
Ann (Taubmann)
Wife of Henry Harrison of Port Erin
Who Died November 2ns 1874
Aged 50 Years
Also of the above named
Henry Harrison
Who died May 15th 1875
Aged 52 years
Also Samuel
Son of the above
Who died October 13th 1884
Aged 24 years
Also Henry
Son of the above who died January 9th 1905
Aged 47 years
Also Elizabeth, wife of the above
Henry Harrison
Who died June 30th 1916 aged 55 years
Also Catherine Alice
Daughter of the above
Born April 11th 1894
Died April 23rd 1920
Rest In Peace
Weather permitting, I will go to Port Erin tomorrow or Friday and take a photo (or 2!)