Blimey ... have gone crosseyed reading these posts .... 
I am so glad we are not the only family with complicated citizenship issues ...
This is us:
DH - British Citizen by birth (and his dad is British) AND NZ citizen by descent (through his mother.
Me - British Citizen by descent - born in SA with SA birth certificate but Dad Brit Citizen by birth and Mum British Citizen by grant.
DS - British Citizen by birth. NZ resident sponsored by his father (DH NZ citizen) but can't claim NZ citizenship through DH as DH is only an NZ citizen by descent (can only claim through one generation)
DD - NZ citizen by birth. British Citizen by descent claimed through DH because he was born in the UK but couldn't claim it through me as I wasn't born in the UK!!!!!!!!!!!!!!!!!!
It is so bloody complicated it does my head in and now I wish I was born, grew up, got married and died in one town ANYWHERE!!!
Threebob .... DH's boss went to Aus and came back for his citizenship ceremony ....
BUT there is a big reason WHY we can't do this:
When applying to be an NZ citizen you have to state an intent to reside in NZ. If DH was a Citizen by Birth or Grant we, DS and I, would be exempt this clause .... BUT as DH is an NZ citizen by descent we are NOT!
I have been told that if we go overseas to live while our application is being processed it will be stopped despite the fact that our long term goal is to end up in NZ and we own a house here and won't be selling it and DH works for an NZ company and could well come back in 2 - 3 years as GM.
If it is stopped then when we come back we will have to requalify for citizenship (3 or 5 years) all over again!!!!
So ... the plan is: DH will take the job ... and DS, DD and I will stay behind until the citizenship comes through ....
What really really pisses me off is that my friend who is a British Citizen with Australian residency is allowed to live in NZ with no questions asked .... 
I need a lie down after writing all that ...