Alan is one of the two aliens that come to Earth. They came to feed off of the life energy that the Earth and all its inhabitants possess. Alan is also a caretaker of the Doom Tree. His assumed family name while masquerading as a student in school is Granger. His relationship with Ann is that of companionship (as aliens) and as siblings (in their assumed identities).Ann is the other alien that accompanied Alan and the Doom Tree to Earth. Her assumed family name is Granger, since she's assuming a brother-sister relationship with Alan