By Lynette Rice
Updated September 29, 2011 at 12:00 PM EDT

The Parenthood season just got a little longer: NBC ordered two additional episodes of the family serial from Jason Katims that stars Peter Krause, Monica Potter and Lauren Graham. That brings the total episode count to 18.

On Tuesday, the drama earned a 2.2 rating/6 share among 18-49 — a 5 percent improvement over debut week. It averaged 5.5 million.

For more:

Spoiler Room: Emmy edition — Parenthood and more

Parenthood season premiere review