It is 2 each and it is a 90% discount of the full fare, plus all taxes. "Immediate family" is parents, grandparents, brothers and sisters and, for the married, parents-in-law. These are standby tickets- if the flight is full they don't travel. The predicted and booked loads can be checked online.
The tickets are booked on the internet and the cost deducted from your salary. It is very straightforward.