The doors of Dunder Mifflin may be closing. But the fences on Dwight Schrute's farm could be swinging wide open in the near future.

NBC has cast another relative for Rainn Wilson's supporting character, who is rumored to become the lead in a spinoff that will feature Dwight, his sister, his nephew and his brother all running a bed and breakfast.

And sources now confirm that Thomas Middleditch has landed the latter role.

The actor, currently starring in The Campaign, will portray Jeb, the third new member of the Schrute family who Office viewers will meet in a backdoor pilot early in Season 9 and who will become a regular if The Farm (working title) is picked up by NBC.

Jeb is described as the antithesis of Dwight. He has found success running a pot farm, but generally lacks ambition and a hard work ethic.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.