I don't much about the Quine's but have come across Ballacorage a few times.

There is a Robert buried at Ballaugh in 1859. He was 49, so born 1810ish. I can see also George buried in 1875 aged 44.

Can't tell from a list of burials if they were brothers though.

Looking through the book of MI's:
R.12 Robert Quine of Ballacorage 23 Dec 1859, aged 49
R.13 Ann Quine otherwise Christery of Ballacorage, 8th April 1847 aged 72 (therefore born c1775)

The graves being next to each other, the address being the same might suggest Mother and Son.

Apologies if you have all this info.