a couple of small details for you ... Joseph is listed in Henry & Coughlan’s General Directory of Cork & Munster 1867
Nash, Joseph, Lake lodge, Glanmire
Lake Lodge is shown in the townland of Poulacurry North on the historic OSI maps - see :
Lake Lodge, Glanmire click on the options to the right to see the historic maps or press 8 for the 25" inch map from about 1890, 7 or 6 for the 1st edition maps from 1820s to 1840s
I dont see any sign of Joseph, or other Nash family, in the townland of Poulacurry North at the time of
Griffth's valuation (1852 for that area) - maybe they moved there from elsewhere ?
Full civil registratioin started in Ireland in 1864 so you would probably need to research parish records for details on Pricilla's baptism and earlier records - do you know the family religion ?
see :
Introduction to Irish RecordsShane