premise: Stannis Baratheon is a fictional character in the "A Song of Ice and Fire" series of epic fantasy novels by American author George R. R. Martin, and its television adaptation "Game of Thrones". He is the second son of Steffon Baratheon, the lord of Storm's End, and his wife Lady Cassana Estermont, and brother to Robert and Renly.
hypothesis: The name of George's brothers are Robert and Renly.
reason: Robert and Renly are not George (R. R. Martin)'s brothers, they are the brothers of the fictional character Stannis Baratheon. The reason I believe the AI was fooled was that I used the exact wording of "Robert and Renly", as well as using other words that appear directly in the text.