JR Moehringer’s bittersweet memoir has been turned into a tender movie by director George Clooney. Moehringer wrote about growing up with his single mother in a ramshackle house with a mostly loving but dysfunctional extended family, learning his most important lessons about life and manhood from his bartender uncle Charlie and the regulars at the Long Island bar, improbably named after Charles Dickens.

Ben Affleck reminds us of how good he can be with a subtle, understated performance as Uncle Charlie that conveys a great deal about the character with honestly and understanding. JR (played as a child by Daniel Ranieri) and his mother (a terrific Lily Rabe) drive up to her parents home with a sense of resignation, if not defeat. She and her siblings cannot seem to get away from the house where they grew up. JR’s dad is a radio announcer and disc jockey. He has no contact with his former wife and son and JR thinks of him as just a voice.

JR’s grandfather is grumpy and often harsh. Uncle Charlie has his own issues, but he is there for JR, encouraging in their conversations and giving him an example of a man who can be relied on. His scenes are by far the highlight of the film, which goes astray after JR achieves his mother’s most important goal and is admitted to Yale. The movie spends too much time on his first romance, which like many first heartbreaks, is not as life-defining as JR (both the character and the writer) think it is.

Affleck shines here, perhaps because he does not have to be a leading man who carries the film or his comfort in being directed by his friend George Clooney, perhaps because his best scenes are with a child, and, like his character, we can see how much of what he does is in support of his young scene partner. Clooney skillfully creates JR’s world so that we can see it as adults and also understand how the young JR sees it as well. Like the bar of the title, the film is an oasis of honesty and kindness.

Parents should know that this movie has very strong language and some crude sexual references and a sexual situation.

Family discussion: What were the most important lessons JR learned from his uncle? Who are your biggest influences outside your immediate family?

If you like this, try: the book and Mary Carr’s The Liar’s Club and the Diane Keaton-directed “Unstrung Heroes.”