Archer

Archer (Grant Show) is Addison's brother. His brain condition leads him to Seattle Grace where Derek, her ex-husband, will operate.
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Montgomerys

Addison and Archer in "Acceptance" from the second season of Private Practice.
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Private Practice Season 2 Episode 15 Quotes

Violet: Looks like you're good at your job.
Dell: Well, I'm not a doctor but, yes, I know a thing or two about pregnant women.
Violet: Stomach cramps?
Dell: Aren't about the baby.
Violet: What are you talking about? I've an alien pea growing inside of me.

Cooper: I need a favor, Charlotte.
Charlotte: I need 3 more nurses, 6 more hours in a day, mandatory martinis at lunch, and, oh yes, to know why the man I was sleeping with is living with another woman.