Siblings starring in separate shows.

I realized that this season you have Emily Deschanel starring in Bones and Zooey Deschanel starring in New Girl – two siblings starring in two separate shows during the same TV season.

Back in 1961, Dwaye Hickman starred in The Many Loves of Dobie Gillis and his brother Darryl* starred in The Americans. As a bonus, there were on two different networks (CBS and NBC, respectively).

Are there any other other sibling combinations where they were starring (or even regular members of the cast) of two different shows at the same time?

*His other brother Darryl didn’t go into acting.

Ron Howard as Opie, and Clint Howard as the kid in Gentle Ben.

James Arness in Gunsmoke, and Peter Graves in Mission Impossible

Chris and Danny Masterson. Chris was on Malcolm in the Middle and Danny That 70s show.

Danny Masterson (Hyde) on That 70’s Show and Christopher Masterson (Francis) on Malcolm in the Middle.

And the series finales for the shows were five days a part.

ETA: Curse my need to add extra detail.

Melissa Gilbert did a voice on Batman:The animated series, while Sara Gilbert was on Roseanne.

Danny (That 70s Show) Masterson and Christopher (Malcolm in the Middle) Masterson.
Angela Cartwright (Lost in Space) and Veronica Cartwright (Daniel Boone), hope I didn’t get those two mixed up
Dick Van Dyke (eponymous) and Jerry Van Dyke (My Mother the Car, Gomer Pyle)

What did he look like before the bear mauled him?

(Didn’t see that someone had already included my example.)

Josh and Seth Myers (Josh was on MADtv and That 70s Show while Seth was on SNL)

Kirk Cameron on Growing Pains and Candace Cameron (D.J.) on Full House.

A bunch of us were typing at the same time. Mastersons, heh.

Dick Van Dyke was doing “the Dick Van Dyke Show” at the same time that his brother Jerry was starring in “My Mother, the Car.”

It must have made for an awkward holiday family get-together chatter.

Jerry: Merry Christmas, Dick! How’s things going for you?

Dick: They couldn’t be better! I’m starring in one of the critically lauded and popular shows on television, one that’s destined to be remembered as a classic of the sitcom form. How’s YOUR show going?

Jerry: (pause) It’s…gonna be remembered all right.

Dick Van Dyke was on Diagnsis: Murder while brother Jerry Van Dyke was on Coach.

ISTR that siblings Kristy and Jimmy McNichol were on several shows simultaneously during the mid/late 1970s, but I don’t remember which ones… Family? Little House on the Prairie? Can’t do an IMDB search/cite right now because my phone’s not co-operating well.

I had to check Wikipedia to verify this, but Justine Bateman was on Family Ties from 1982-89 while Jason Bateman was on Silver Spoons and then The Hogan Family during this time.

Studios are likelier to hire kid actors if they’re twins. One can work while the other sleeps, body and stunt doubles, all that. It helps studios get around some specific child labor laws, and it’s convenient. My nomination for the hardest-working twins in Hollywood is Dylan and Cole Sprouse. Since the late 90s, if there was a cute tow-headed boy on a sitcom or in an Adam Sandler movie, it was probably them.

They have (had? No idea) their own show, The Suite Life with Zack and Cody. During that run, they also had a lot of spillover onto Hannah Montana and That’s So Raven. I’m sure they somehow qualify for inclusion in this thread.

Also, while Michael Gross was on Family Ties, his sister Mary was on Saturday Night Live.

Kristy McNichol was in Family from 1976 to 1980. During that period, her brother Jimmy was in two series: The Fitzpatricks and California Fever.

Rob Corddry was a regular on The Daily Show while his brother Nathan was in Studio 60 on the Sunset Strip.