Oliver "Ollie" Jones (born 1992 or 1993) is Junie B.'s baby brother. He is born in the book Junie B. Jones and a Little Monkey Business. In Junie B., First Grader:BOO! And I Mean It!, he is said to be ten months old in the month of October, so he is probably born in December. Junie B. dislikes her brother and thinks he's dumb, and they have somewhat of a sibling rivalry. Junie B. qoutes "we didn't actually need a baby but no one consulted me about it." However, she does show that she cares for him sometimes, like in Junie B., First Grader: Toothless Wonder where Junie B. concludes that Ollie's first tooth was the baby tooth Junie B. lost, and she smiles at him. Ollie's first word was "moo" which was revealed in Junie B., First Grader: BOO! And I Mean It which was the reason he was dressed up in a cow suit. In Junie B. Jones and That Meanie Jim's Birthday he is show to have a hard time to get to sleep. He has black fuzzy hair and sleeps in a crib.