Steve,
In June I spoke to a lovely 86 year old man - Kevin Whelan of Loughnageer, and mentioned the Crowley connection. He said that Johanna Whelan who married Peter Crowley was a sister of Tom Whelan, who was probably a Whelan of Ballycullane rather than a Whelan of Loughnageer (but he wasn't sure).
He said they had lots of children including Mrs Pat Stafford who has a shop in Ballycullane and her daughter married a son of Kevin (above) whose name I seem to have written down incorrectly so if you'd like it I'll see if I can get it for you.
Hope this helps,
Eileen in Sydney