You have 12 months from DOJ to bring your wife and kid(s) out on a free ticket, after that you'll have to do it on ID90, the same with cargo 12 months from DOJ.
With regards staff travel its not eligible to family i.e parents/brothers/sisters until after 3 months of DOJ, if your not married you get and ID90
AND ID50 for each of them, if you are married you get an ID90
OR ID50 (so basically only one ticket), this is done per year Jan -> Dec, they are eligible for Business class or Economy.
Oh and your wife's family get nothing!
