Boris Theodore John William Paul Eric Anderson (born January 1, 1971) is a member of Caillou's family. His last name, Anderson, comes from Issac Anderson He is a anti-heroic parody character of the canon character, Boris, from the PBS Kids animated series, "Calliou". (the main jumpstarter of Caillou Gets Grounded) and this name is now widely accepted. Some of his lesser used last names include Boris SHUT UP JERK (DAVID YOUNG Family), Boris Green (BrentAnimate), and Boris Tubester (GoTube). He is the husband of Doris (Ms. Martin in some series) and the father of Caillou and Rosie, and, in some series which include extraneous family members, Cody, Daisy, Emily, Lily, Hannah, Sapphire, Agnes and Amanda. Eric Is The Accurate Voice For Boris.

Boris is a mean, uncaring, and hating father of Caillou, and likes Rosie better because she's a female that looks like his wife, Doris. However in some users' series, he's nicer. But it's definitely not true to his real self. He becomes jealous easily of people who are more successful than him, especially that of his younger brother Loris. No one is exempt from Boris's hate, not even his own family.