Per Seed of Isaac re: Kissacks, Ballavale is in Santan and the fellow Sue quoted is the right person.
William Kissack married Jane Clague 1866 and had Elizabeth 1867; Jane died in 1867 soon after Elizabeth was born.
He remarried Ann Shimmin in 1875 and they had Margaret Ann in 1877; Ann died in 1878
According to the book, Margaret Ann m Robert Owen Costain in 1897--however, Brian Lawson's marriage records on his site indicates the fellow's name was Albert Owen Costain.

The Kissack book gives the lineage of this Kissack family.

Santan MI
J 11
In memory of WILLIAM KISSACK of Ballachrink who died July 12th 1886 aged 52 years
Let us labour therefore to enter into that rest Heb.IV.11

Santan MI
J
13
In memory of ANNE KISSACK (alias SHIMMIN) who departed this life July 30th 1878 aged 30 years
Safe in the arms of Jesus