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The Boston Globe

Television

Critics Corner: What’s on TV Sunday

Family Tree Sunday at 10:30 p.m., HBO

This is a sweet new series from Christopher Guest, the guy behind “Best in Show,” “A Mighty Wind,” and the superior “Waiting for Guffman.” It’s well worth checking out, if you liked any of those movies. The premise is basic: A lost soul, played with calm appeal by Chris O’Dowd (pictured) from “Bridesmaids” and “Girls,” goes on a journey to learn about his roots. But the characters he meets along the way are a little crazy, most of all his ventriloquist sister, who shares all her darkest and crudest thoughts through her hand puppet.

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