About a Boy (2002)

Directed by Chris Weitz and Paul Weitz and starring Hugh Grant, About a Boy follows a single man whose life changes after forming an unexpected bond with a young boy. Based on the novel by Nick Hornby, the film explores relationships, personal growth, and everyday life in London.

Från IMDB:
Will, who attends single parent meetings to woo women, meets Marcus, a troubled 12-year-old boy. As they become friends, Will learns to be responsible while he helps Marcus with his studies.