Q. Being a fan of Duck Dynasty on A&E, I’ve noticed that when they show old pictures of the brothers (without beards) there are four of them. No. 4 is not mentioned on the show. Do you know anything about him?

Yes. In addition to brothers Willie, Jase and Jeptha — seen on the show along with their father, Phil, and uncle Si — there is a fourth Robertson brother, Alan. The oldest of the brothers “left the duck call business when he received the call for full time ministry in 1988 and now serves as a senior pastor in West Monroe, LA.,” says the site of Duck Commander, the family enterprise. “He calls himself a Jacob in a family of Esaus.”

The show will be back for a third season on Feb. 27. Q. Why are there so many reruns in the middle of the season?

Sometimes a network does not want to waste a new episode of a show opposite a big event like the Super Bowl. But a bigger reason is that network shows typically make 22 episodes, which covers only about half of the traditional TV season from September through May. Q. What did Mark Harmon do before NCSI?

Harmon, who plays Leroy Jethro Gibbs on the CBS series, has long been one of the most reliable actors in movies and television. His TV series included St. Elsewhere, Chicago Hope and Reasonable Doubts, and he played serial killer Ted Bundy in the TV movie The Deliberate Stranger. Among his big-screen credits are Wyatt Earp and The Presidio.

As a student at UCLA, he was a standout quarterback — no surprise considering his father, Tom Harmon, was a Heisman Trophy winner before he became a broadcaster. His mother was actress Elyse Knox. Q. I just loved Paget Brewster on Criminal Minds. I have never seen the episode in which she came back after supposedly dying, and I have watched a million re-runs.

I think you are looking for “It Takes a Village,” which aired in September 2011 at the beginning of the show’s seventh season. (The current season is its eighth.) It revealed that the death of Brewster’s character, Emily Prentiss, in the previous season had been faked.

In addition to occasional reruns on CBS, the series also replays on ION and A&E, so you may want to keep an eye on them. Failing that, the seventh season is available on DVD.