I just found this note. I have a lot of information on John Heffernan (1818-1895) of Mooghan North. He is my great-great grandfather. His wife was Sarah O'Neil. Their sons Thomas, Patrick, and James emigrated to Rochester, NY along with a daughter Bridget. A son Andrew went to Dublin for a while and was a member of the Dublin Metropolitan Police. He was also the anchor of the DMP tug-of-war team. Tug-of-war was a pretty popular sport in the late 1800s. I've found newspaper articles of crowds of 30-40,000 people attending the big events and even a crowd of around 25,000 just to welcome the team home after a big victory in Scotland. After Andrew retired from the DMP he moved back to Clare and had a shop in Quin. He is buried at Quin Abbey.
John and Sarah's son Denis married Margaret McNamara and stayed on the family farm. Their sons Andrew, John, Patrick, and Francis (Frank) ran the farm (along with the McCormacks) until the late 1900s
I have a lot of other Heffernans in my tree, but i don't seem to have a John Heffernan married to Margaret Rourke. I hope you have found the information you need.
All the best,
DanZ