I know this is a long time after your question was posted, but I came across this today on another web board. It appears to be on the same subject as your question.

I was also searching on the Cowins, as Ballacowin was occupied by one of my ancestors in the 1850's (not a Cowin) but Margaret Quine (Kelly) who by coincidence was raising the son of Isabell Kelly who was named Benjamin Kneale at the farm in Ballacowin

THIS IS THE MESSAGE:
The link below leads to the question I read earlier today.

http://genforum.genealogy.com

Just do a search on Cowin and you should find this message dated this week.

Hiya!
You dont have a Charles (Chas) Cowin anywhere in your research do you? He had a daughter Charlotte to an Isabelle Kelly in German around 1842. Would love to hear from you if you have! Regards, Jan