S6E4: Stewie Kills Lois
Peter, Lois has been dead for a whole year.
You're gonna have to tell him sometime.
(SHUSHING) Hi, Dad. Did we get any mail from Mom at the health spa today?
Nope. Sorry, Chris.
She said she's going straight from the spa right back to Europe.
But I haven't seen Mom since she took me back-to-school shopping.