Cathrine Grace

Lynette and Tom feel that it's time for twins Porter and Preston to move out on their own and learn how to become responsible adults, but the boys end up moving out to a pad that's a little too close to home.

Meredith and Lexie's father returns to Seattle Grace with stomach pains and a new girlfriend; Alex butts heads with the new OB; Mark bribes Jackson for information on Lexie.

Malcolm and Stevie attempt a science experiment and are shocked when Reese begs to help.

The detectives start investigating the robbery of a deli, where the owner was killed. Back at the squad, Sipowicz has done some thinking this past week since the hostage situation.