COMING ATTRACTIONS

The Family That Plays Together: Tonight’s episode of “Father Dowling Mysteries” (NBC at 8 p.m.) will be a family affair, with Tracy Nelson in her regular role as Sister Steve, her husband, actor William R. Moses, cast as a former beau, and her grandmother Harriet Nelson guesting as a nun. Says Harriet: “I play an older retired nun who makes rum cakes for the church and nibbles a bit on the batter, and therein lies the tale.” The actress, who starred for many years on “The Adventures of Ozzie and Harriet,” told The Times Thursday, “I really had a good time playing something in costume. Mostly, I’m always seen as Harriet.”