THE SMART TRICK OF ENDERS GAME BOOK SALE THAT NOBODY IS DISCUSSING

So as to establish a safe defense towards a hostile alien race's future attack, government agencies breed boy or girl geniuses and prepare them as soldiers. A superb younger boy, Andrew "Ender" Wiggin lives with his form but distant dad and mom, his sadistic brother Peter, and the person he enjoys a lot more than everyone else, his sister Valentine