Hi Janice, and thanks a mill for your reply.
It's so frustrating that I have Michael Rorke & Bridget McNally's Church marriage cert in 1851, but no parents or townland mentioned. Not sure if I'll ever find the info, but I'll certainly keep your Rourke family info in mind.
At the moment, I am awaiting the Y-DNA results from FTDNA of my brother Dermot, which should be available in next 3-4 weeks. Can't wait! Perhaps that will shed some light, so we're keeping our fingers crossed.