Hello,Welcome to Just Answer and thanks for contacting us. We need some more information before we can start looking. For instance, around when were James and Elizabeth MAIR born and where? Who were the other siblings? When did they migrate to NZ? Do you know who the men married, when, and where? Who was Ann and which Cowie did she marry and where? In genealogy, we work backward using as much information as possible.
Thanks for all the additional information. Now, what is it that we can help you find out?
I've found some of this for you.
Brothers James and John Mair were the children of George Mair (1767-1836) and Margaret Forsyth (1775-1859) who lived in New Deer, Aberdeenshire when their children were born. The kids were:
James and Elizabeth (nee Webster) Mair remained in Aberdeenshire through at least 1881 when he is listed as 77 years old and she as 75. Living with them in 1881 was their grandson William Cowie b 1875 in Lonmay, Aberdeenshire (son of Ann Mair 1845-1891 and Alexander Cowie).
As you know, most Scottish records are not online so I cannot tell you what happened to Isabella. She was in the 1841 and 1851 censuses, but not in 1861. She may have married or died, but there are no records available online.