Hi Shona,
Unless you happen to be in Scotland, you will only get the births online at Scotland'sPeople (for a small fee).
The twins boys are registered as Patrick and James Casey - my great grandmother, Helen McDonald registered the births and probably with her Irish accent, the Registrar took Tracey to be Casey and since she signed with an 'X' wouldn't have realized the error. They were also baptized under the name Casey. It took me many years before finding these births.
By the way, Thomas is registered as James. Somewhere between his birth in 1858 and the 1861 census he became Thomas (unless there was another child that I'm not finding named Thomas James).
Patrick and James were born 11th Feb 1858 at Steel Street, Coatbridge, Lanark, Scotland. Patrick was an hour older than James (or Thomas). They were baptized at St. Patrick's, Coatbridge 23rd Feb 1858 by Fr. John O'Dwyer. Sponsors were Bridget Callaghan for Patrick and Mary McArdle for James.
The family moved to England before going to New Zealand and there is a likely death for Patrick 2nd Qtr 1858 in Stockton, England.
Ann Hearty was my 2xgreat aunt - my great great grandfather Patrick's sister, and they didn't make it easy to find them.
Regards,
Anne