Allie is Karim's little brother. His real name is Amar, but he goes by Allie to avoid "racial trouble." He's four years younger and when they're young, Karim mostly ignores Allie. When Mum and Dad divorce, Allie moves with Mum to Ted and Jean's house. At the end of the novel when Allie and Karim spend time together, Karim finds that Allie is actually an interesting and passionate adult.