[SPOILERS] The rabbits are more important than Nicholas Cage.
Don't read this if you don't want the ending of the movie ruined.
What did the aliens accept the two kids, but not the father - Cage's character?
I mean, I presumed they let the rabbits tag along to keep the kids happy, surely it would have been even less emotionally difficult if they allowed one single extra passenger. I can't see the rabbits being of benefit. They aren't going to start a new race and a diverse ecosystem by allowing two rabbits to breed.
I guess if he went, he would be just a burden, and die eventually. Or maybe they knew his presence would disturb the new race they predict the two kids are capable of starting.
Or maybe I am just over thinking a part of a fictional movie that even the writers didn't bother thinking about, thus there is no reasoning or answer lol
Ain't a bad movie considering the rather low IMDB rating.