We already received ITA last week and we are now on the process of completing required documents. Included in my application is my wife and 3 children. Im currently on a work visa and working for 5 months now here in Auckland. If ever my permanent residency is approved i plan to get first my wife and eldest son who is 9 yrs old and my 2 other younger children will follow until my wife gets a job. Would that be possible to get first my wife and son? Is there a rule which states all members included in the application should be here at thesame time once application is approved or is there an expiration to the PR approval?

Hoping for any help from forum members. Thanks in advance.