Robinson and Curtains of County Limerick

I am interested in finding the descendants of John Robinson and Johanna Curtain who married in Limerick in 1836. They had seven children, John Charles who emigrated to Pittsburgh, George who went to England and Mary Jane, William, Caroline, David and Henry who went to New Zealand.

John's family MAY have come from Killucan in County Westmeath and Johanna's from County Cork