After returning to London, in what ways does Karim realize he is finally an adult?

When Karim returns to London, he visits everyone who is important to him and realizes he now has adult relationships with them. This particularly includes Karim's parents and Eva. Karim also has an adult conversation with his brother, Allie, for the first time ever and they begin forming a relationship that has never quite been there. Finally, Karim realizes he has moved back his childhood relationship with Jamila.