You, your spouse/registered companion and parents can travel immediately. After 2 years you can register up to 12 people and you get 24 one way passes per year. Once you put someone on they must stay there for a year before you can take them off. Anyone who isn't on the no-fly list can use them. If anyone lives outside the US there is extra paperwork to fill out.

Your parents count toward the 24 (I think) You and your spouse/RC have unlimited travel.

If I made a mistake someone will let us know.