his isn’t a complete listing of the houses and characters in Game of Thrones - there simply isn’t any practical way to display all that information at once. The families of Baratheon, Lannister, Targaryen, Stark and Arryn are represented. On the plus side, the image is SPOILER-FREE.
The information in the graphic was current and correct at of the time of the Game of Thrones premiere, however that doesn’t mean it will stay that way. You can bet that people will start dying quickly, and without spoiling any of the upcoming episodes, not all of the information shown may be technically accurate.