Castle and Gina deal with Alexis in this scene. It's courtesy of the episode "Anatomy of a Murder."
Castle attempts a smile in this scene. But circumstances aren't making it easy for him to be happy.
We haven't seen Gina often on season three of Castle. But she tries to bond with Alexis on the episode Anatomy of a Murder.

Castle Season 3 Episode 5 Quotes

Beckett: In fact he performed a bypass surgery this morning, saved his patients life. What did you do this morning Castle?
Castle: I made waffles.

Gina: Do you remember our song?
Castle: ACDC, You shook me all night long.