My g-g-grandfather Patrick BRENNAN died in NZ in 1887 - according to his death certificate he was born in Whitewell (?), Ireland c. 1815. He married Margaret MCCARTHY in Cloyne 1844. Known children (those alive at his death) Julia born c. 1858, Albina c. 1860 (born in Cloyne?) and John in NZ c. 1867. The family arrived in New Zealand (from London) in 1864.
Margaret's sister Fanny HANNING (nee MCCARTHY) was also in New Zealand, and was a hotel keeper in Oamaru in the South Island.
I am fairly new to Ireland research and would greatly appreciate any help in where to find the following?
Where is Whitewell? Is it near Cloyne?
Where is the best place (if there is one!) to find more information about his marriage to Margaret? Or any other children they had?
There seems a large gap between the marriage and the birth of Julia in 1858 - what happened during that time?
Although NZ death records hold a great deal of information, by the time Patrick died in 1887, his wife Margaret only put his birthplace on the record - his parents are listed as unknown.
Any leads gratefuly received

Fiona
Auckland
New Zealand