Castle and Gina deal with Alexis in this scene. It's courtesy of the episode "Anatomy of a Murder."
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Castle attempts a smile in this scene. But circumstances aren't making it easy for him to be happy.
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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.
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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.