Dazedconfused
We get unlimited tickets (ID50/ID90) with Etihad. We can book ID50 in Pearl & Diamond zone too.
We have ZED agreements with many airlines as well where we can book ID50/ID90.
Your Parents will get unlimited travel on ID90's on Etihad. They will get 2 ID50's each a year also with Etihad.
They are also entitled to ZED tickets with other Carriers.
Your 8 friends/relatives get 10 tickets (5 ID50 & 5 ID90) between the 8 of them a year from your anniversary date.