I almost forgot to set a timer for this one last week. Boy, I'm glad I didn't forget. In the spirit of Best in Show and A Mighty Wind, Christopher Guest has given us "Family Tree". Critics are indicating that it will take a few episodes before it really gets rolling, but all the promise was there in the first episode. This show gently mocks, but also subtly respects, those who are led to pursue their genealogy by the accidental discovery of just one ancestor they didn't know know had existed. It's a half hour a week of pure amusement for those who love Guest's work. From one review: The pilot is repeated Sunday prior to the airing of episode 2.