Lynette and Tom's Twins (Season 2)

Maybe I missed something since I've been binged watching the show, but I'm on episode 2 of Season 2 and Lynette and Tom are acting like they only have 2 kids- Penny the baby and Parker - instead of 4. I grew very fond of those crazy boys. What happened to them?

I just got to the part where Lynette brought home school supplies for Parker. he is outside playing basketball with Tom, and there was nearby crib with Penny inside.

Can anyone tell me where the twins went??