Sorry, just spotted a burial for a Jane Kissack aged 25 buried in Santon 23 Jun 1867, in Brian's index.

There is also a William Kissack aged 34 living with his 78 year old father William and a 3 year old Elizabeth Kissack at Balnahowin, Santon, in the 1871 census, although the younger William is down as 'unmarried'.